08-27-周三_17-09-29
This commit is contained in:
503
node_modules/lodash.pick/index.js
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503
node_modules/lodash.pick/index.js
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/**
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* lodash (Custom Build) <https://lodash.com/>
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* Build: `lodash modularize exports="npm" -o ./`
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* Copyright jQuery Foundation and other contributors <https://jquery.org/>
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* Released under MIT license <https://lodash.com/license>
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* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
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* Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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*/
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/** Used as references for various `Number` constants. */
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var INFINITY = 1 / 0,
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MAX_SAFE_INTEGER = 9007199254740991;
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/** `Object#toString` result references. */
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var argsTag = '[object Arguments]',
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funcTag = '[object Function]',
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genTag = '[object GeneratorFunction]',
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symbolTag = '[object Symbol]';
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/** Detect free variable `global` from Node.js. */
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var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
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/** Detect free variable `self`. */
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var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
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/** Used as a reference to the global object. */
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var root = freeGlobal || freeSelf || Function('return this')();
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/**
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* A faster alternative to `Function#apply`, this function invokes `func`
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* with the `this` binding of `thisArg` and the arguments of `args`.
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*
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* @private
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* @param {Function} func The function to invoke.
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* @param {*} thisArg The `this` binding of `func`.
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* @param {Array} args The arguments to invoke `func` with.
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* @returns {*} Returns the result of `func`.
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*/
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function apply(func, thisArg, args) {
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switch (args.length) {
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case 0: return func.call(thisArg);
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case 1: return func.call(thisArg, args[0]);
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case 2: return func.call(thisArg, args[0], args[1]);
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case 3: return func.call(thisArg, args[0], args[1], args[2]);
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}
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return func.apply(thisArg, args);
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}
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/**
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* A specialized version of `_.map` for arrays without support for iteratee
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* shorthands.
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*
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* @private
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* @param {Array} [array] The array to iterate over.
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* @param {Function} iteratee The function invoked per iteration.
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* @returns {Array} Returns the new mapped array.
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*/
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function arrayMap(array, iteratee) {
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var index = -1,
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length = array ? array.length : 0,
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result = Array(length);
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while (++index < length) {
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result[index] = iteratee(array[index], index, array);
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}
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return result;
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}
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/**
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* Appends the elements of `values` to `array`.
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*
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* @private
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* @param {Array} array The array to modify.
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* @param {Array} values The values to append.
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* @returns {Array} Returns `array`.
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*/
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function arrayPush(array, values) {
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var index = -1,
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length = values.length,
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offset = array.length;
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while (++index < length) {
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array[offset + index] = values[index];
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}
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return array;
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}
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/** Used for built-in method references. */
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var objectProto = Object.prototype;
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/** Used to check objects for own properties. */
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var hasOwnProperty = objectProto.hasOwnProperty;
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/**
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* Used to resolve the
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* [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
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* of values.
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*/
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var objectToString = objectProto.toString;
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/** Built-in value references. */
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var Symbol = root.Symbol,
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propertyIsEnumerable = objectProto.propertyIsEnumerable,
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spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined;
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/* Built-in method references for those with the same name as other `lodash` methods. */
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var nativeMax = Math.max;
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/**
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* The base implementation of `_.flatten` with support for restricting flattening.
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*
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* @private
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* @param {Array} array The array to flatten.
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* @param {number} depth The maximum recursion depth.
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* @param {boolean} [predicate=isFlattenable] The function invoked per iteration.
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* @param {boolean} [isStrict] Restrict to values that pass `predicate` checks.
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* @param {Array} [result=[]] The initial result value.
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* @returns {Array} Returns the new flattened array.
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*/
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function baseFlatten(array, depth, predicate, isStrict, result) {
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var index = -1,
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length = array.length;
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predicate || (predicate = isFlattenable);
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result || (result = []);
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while (++index < length) {
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var value = array[index];
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if (depth > 0 && predicate(value)) {
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if (depth > 1) {
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// Recursively flatten arrays (susceptible to call stack limits).
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baseFlatten(value, depth - 1, predicate, isStrict, result);
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} else {
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arrayPush(result, value);
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}
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} else if (!isStrict) {
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result[result.length] = value;
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}
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}
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return result;
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}
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/**
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* The base implementation of `_.pick` without support for individual
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* property identifiers.
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*
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* @private
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* @param {Object} object The source object.
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* @param {string[]} props The property identifiers to pick.
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* @returns {Object} Returns the new object.
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*/
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function basePick(object, props) {
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object = Object(object);
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return basePickBy(object, props, function(value, key) {
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return key in object;
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});
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}
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/**
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* The base implementation of `_.pickBy` without support for iteratee shorthands.
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*
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* @private
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* @param {Object} object The source object.
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* @param {string[]} props The property identifiers to pick from.
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* @param {Function} predicate The function invoked per property.
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* @returns {Object} Returns the new object.
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*/
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function basePickBy(object, props, predicate) {
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var index = -1,
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length = props.length,
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result = {};
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while (++index < length) {
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var key = props[index],
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value = object[key];
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if (predicate(value, key)) {
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result[key] = value;
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}
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}
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return result;
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}
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/**
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* The base implementation of `_.rest` which doesn't validate or coerce arguments.
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*
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* @private
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* @param {Function} func The function to apply a rest parameter to.
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* @param {number} [start=func.length-1] The start position of the rest parameter.
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* @returns {Function} Returns the new function.
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*/
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function baseRest(func, start) {
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start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
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return function() {
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var args = arguments,
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index = -1,
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length = nativeMax(args.length - start, 0),
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array = Array(length);
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while (++index < length) {
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array[index] = args[start + index];
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}
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index = -1;
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var otherArgs = Array(start + 1);
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while (++index < start) {
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otherArgs[index] = args[index];
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}
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otherArgs[start] = array;
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return apply(func, this, otherArgs);
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};
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}
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/**
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* Checks if `value` is a flattenable `arguments` object or array.
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*
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* @private
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is flattenable, else `false`.
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*/
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function isFlattenable(value) {
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return isArray(value) || isArguments(value) ||
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!!(spreadableSymbol && value && value[spreadableSymbol]);
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}
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/**
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* Converts `value` to a string key if it's not a string or symbol.
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*
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* @private
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* @param {*} value The value to inspect.
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* @returns {string|symbol} Returns the key.
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*/
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function toKey(value) {
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if (typeof value == 'string' || isSymbol(value)) {
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return value;
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}
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var result = (value + '');
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return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
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}
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/**
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* Checks if `value` is likely an `arguments` object.
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*
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* @static
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* @memberOf _
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* @since 0.1.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is an `arguments` object,
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* else `false`.
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* @example
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*
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* _.isArguments(function() { return arguments; }());
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* // => true
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*
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* _.isArguments([1, 2, 3]);
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* // => false
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*/
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function isArguments(value) {
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// Safari 8.1 makes `arguments.callee` enumerable in strict mode.
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return isArrayLikeObject(value) && hasOwnProperty.call(value, 'callee') &&
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(!propertyIsEnumerable.call(value, 'callee') || objectToString.call(value) == argsTag);
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}
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/**
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* Checks if `value` is classified as an `Array` object.
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*
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* @static
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* @memberOf _
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* @since 0.1.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is an array, else `false`.
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* @example
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*
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* _.isArray([1, 2, 3]);
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* // => true
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*
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* _.isArray(document.body.children);
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* // => false
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*
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* _.isArray('abc');
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* // => false
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*
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* _.isArray(_.noop);
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* // => false
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*/
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var isArray = Array.isArray;
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/**
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* Checks if `value` is array-like. A value is considered array-like if it's
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* not a function and has a `value.length` that's an integer greater than or
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* equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
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*
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* @static
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* @memberOf _
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* @since 4.0.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is array-like, else `false`.
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* @example
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*
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* _.isArrayLike([1, 2, 3]);
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* // => true
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*
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* _.isArrayLike(document.body.children);
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* // => true
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*
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* _.isArrayLike('abc');
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* // => true
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*
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* _.isArrayLike(_.noop);
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* // => false
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*/
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function isArrayLike(value) {
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return value != null && isLength(value.length) && !isFunction(value);
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}
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/**
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* This method is like `_.isArrayLike` except that it also checks if `value`
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* is an object.
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*
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* @static
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* @memberOf _
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* @since 4.0.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is an array-like object,
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* else `false`.
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* @example
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*
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* _.isArrayLikeObject([1, 2, 3]);
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* // => true
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*
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* _.isArrayLikeObject(document.body.children);
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* // => true
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*
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* _.isArrayLikeObject('abc');
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* // => false
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*
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* _.isArrayLikeObject(_.noop);
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* // => false
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*/
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function isArrayLikeObject(value) {
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return isObjectLike(value) && isArrayLike(value);
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}
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/**
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* Checks if `value` is classified as a `Function` object.
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*
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* @static
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* @memberOf _
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* @since 0.1.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is a function, else `false`.
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* @example
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*
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* _.isFunction(_);
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* // => true
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*
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* _.isFunction(/abc/);
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* // => false
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*/
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function isFunction(value) {
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// The use of `Object#toString` avoids issues with the `typeof` operator
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// in Safari 8-9 which returns 'object' for typed array and other constructors.
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var tag = isObject(value) ? objectToString.call(value) : '';
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return tag == funcTag || tag == genTag;
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}
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/**
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* Checks if `value` is a valid array-like length.
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*
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* **Note:** This method is loosely based on
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* [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
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*
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* @static
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* @memberOf _
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* @since 4.0.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
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* @example
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*
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* _.isLength(3);
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* // => true
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*
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* _.isLength(Number.MIN_VALUE);
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* // => false
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*
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* _.isLength(Infinity);
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* // => false
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*
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* _.isLength('3');
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* // => false
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*/
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function isLength(value) {
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return typeof value == 'number' &&
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value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
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}
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/**
|
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* Checks if `value` is the
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* [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
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* of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
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*
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* @static
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* @memberOf _
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* @since 0.1.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is an object, else `false`.
|
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* @example
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*
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* _.isObject({});
|
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* // => true
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*
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* _.isObject([1, 2, 3]);
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* // => true
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*
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* _.isObject(_.noop);
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* // => true
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*
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* _.isObject(null);
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* // => false
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*/
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function isObject(value) {
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var type = typeof value;
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return !!value && (type == 'object' || type == 'function');
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}
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||||
/**
|
||||
* Checks if `value` is object-like. A value is object-like if it's not `null`
|
||||
* and has a `typeof` result of "object".
|
||||
*
|
||||
* @static
|
||||
* @memberOf _
|
||||
* @since 4.0.0
|
||||
* @category Lang
|
||||
* @param {*} value The value to check.
|
||||
* @returns {boolean} Returns `true` if `value` is object-like, else `false`.
|
||||
* @example
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||||
*
|
||||
* _.isObjectLike({});
|
||||
* // => true
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||||
*
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||||
* _.isObjectLike([1, 2, 3]);
|
||||
* // => true
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||||
*
|
||||
* _.isObjectLike(_.noop);
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||||
* // => false
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||||
*
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||||
* _.isObjectLike(null);
|
||||
* // => false
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||||
*/
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||||
function isObjectLike(value) {
|
||||
return !!value && typeof value == 'object';
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||||
}
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||||
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||||
/**
|
||||
* Checks if `value` is classified as a `Symbol` primitive or object.
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||||
*
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||||
* @static
|
||||
* @memberOf _
|
||||
* @since 4.0.0
|
||||
* @category Lang
|
||||
* @param {*} value The value to check.
|
||||
* @returns {boolean} Returns `true` if `value` is a symbol, else `false`.
|
||||
* @example
|
||||
*
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||||
* _.isSymbol(Symbol.iterator);
|
||||
* // => true
|
||||
*
|
||||
* _.isSymbol('abc');
|
||||
* // => false
|
||||
*/
|
||||
function isSymbol(value) {
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||||
return typeof value == 'symbol' ||
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||||
(isObjectLike(value) && objectToString.call(value) == symbolTag);
|
||||
}
|
||||
|
||||
/**
|
||||
* Creates an object composed of the picked `object` properties.
|
||||
*
|
||||
* @static
|
||||
* @since 0.1.0
|
||||
* @memberOf _
|
||||
* @category Object
|
||||
* @param {Object} object The source object.
|
||||
* @param {...(string|string[])} [props] The property identifiers to pick.
|
||||
* @returns {Object} Returns the new object.
|
||||
* @example
|
||||
*
|
||||
* var object = { 'a': 1, 'b': '2', 'c': 3 };
|
||||
*
|
||||
* _.pick(object, ['a', 'c']);
|
||||
* // => { 'a': 1, 'c': 3 }
|
||||
*/
|
||||
var pick = baseRest(function(object, props) {
|
||||
return object == null ? {} : basePick(object, arrayMap(baseFlatten(props, 1), toKey));
|
||||
});
|
||||
|
||||
module.exports = pick;
|
||||
Reference in New Issue
Block a user