08-27-周三_17-09-29

node_modules/traverse/test/stop.js

@@ -0,0 +1,46 @@
+'use strict';
+
+var test = require('tape');
+var traverse = require('../');
+
+test('stop', function (t) {
+	var visits = 0;
+	traverse('abcdefghij'.split('')).forEach(function (node) {
+		if (typeof node === 'string') {
+			visits += 1;
+			if (node === 'e') { this.stop(); }
+		}
+	});
+
+	t.equal(visits, 5);
+	t.end();
+});
+
+test('stopMap', function (t) {
+	var s = traverse('abcdefghij'.split('')).map(function (node) {
+		if (typeof node === 'string') {
+			if (node === 'e') { this.stop(); }
+			return node.toUpperCase();
+		}
+		return void undefined;
+	}).join('');
+
+	t.equal(s, 'ABCDEfghij');
+	t.end();
+});
+
+test('stopReduce', function (t) {
+	var obj = {
+		a: [4, 5],
+		b: [6, [7, 8, 9]],
+	};
+	var xs = traverse(obj).reduce(function (acc, node) {
+		if (this.isLeaf) {
+			if (node === 7) { this.stop(); } else { acc.push(node); }
+		}
+		return acc;
+	}, []);
+
+	t.same(xs, [4, 5, 6]);
+	t.end();
+});