mirror of
https://github.com/whoisclebs/lodash.git
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300 lines
12 KiB
JavaScript
300 lines
12 KiB
JavaScript
$(document).ready(function() {
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module("Collections");
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test("collections: each", function() {
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_.each([1, 2, 3], function(num, i) {
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equal(num, i + 1, 'each iterators provide value and iteration count');
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});
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var answers = [];
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_.each([1, 2, 3], function(num){ answers.push(num * this.multiplier);}, {multiplier : 5});
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equal(answers.join(', '), '5, 10, 15', 'context object property accessed');
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answers = [];
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_.forEach([1, 2, 3], function(num){ answers.push(num); });
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equal(answers.join(', '), '1, 2, 3', 'aliased as "forEach"');
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answers = [];
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var obj = {one : 1, two : 2, three : 3};
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obj.constructor.prototype.four = 4;
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_.each(obj, function(value, key){ answers.push(key); });
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equal(answers.join(", "), 'one, two, three', 'iterating over objects works, and ignores the object prototype.');
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delete obj.constructor.prototype.four;
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answer = null;
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_.each([1, 2, 3], function(num, index, arr){ if (_.include(arr, num)) answer = true; });
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ok(answer, 'can reference the original collection from inside the iterator');
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answers = 0;
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_.each(null, function(){ ++answers; });
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equal(answers, 0, 'handles a null properly');
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});
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test('collections: map', function() {
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var doubled = _.map([1, 2, 3], function(num){ return num * 2; });
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equal(doubled.join(', '), '2, 4, 6', 'doubled numbers');
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doubled = _.collect([1, 2, 3], function(num){ return num * 2; });
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equal(doubled.join(', '), '2, 4, 6', 'aliased as "collect"');
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var tripled = _.map([1, 2, 3], function(num){ return num * this.multiplier; }, {multiplier : 3});
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equal(tripled.join(', '), '3, 6, 9', 'tripled numbers with context');
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var doubled = _([1, 2, 3]).map(function(num){ return num * 2; });
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equal(doubled.join(', '), '2, 4, 6', 'OO-style doubled numbers');
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var ids = _.map($('div.underscore-test').children(), function(n){ return n.id; });
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ok(_.include(ids, 'qunit-header'), 'can use collection methods on NodeLists');
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var ids = _.map(document.images, function(n){ return n.id; });
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ok(ids[0] == 'chart_image', 'can use collection methods on HTMLCollections');
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var ifnull = _.map(null, function(){});
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ok(_.isArray(ifnull) && ifnull.length === 0, 'handles a null properly');
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var length = _.map(Array(2), function(v) { return v; }).length;
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equal(length, 2, "can preserve a sparse array's length");
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});
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test('collections: reduce', function() {
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var sum = _.reduce([1, 2, 3], function(sum, num){ return sum + num; }, 0);
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equal(sum, 6, 'can sum up an array');
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var context = {multiplier : 3};
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sum = _.reduce([1, 2, 3], function(sum, num){ return sum + num * this.multiplier; }, 0, context);
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equal(sum, 18, 'can reduce with a context object');
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sum = _.inject([1, 2, 3], function(sum, num){ return sum + num; }, 0);
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equal(sum, 6, 'aliased as "inject"');
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sum = _([1, 2, 3]).reduce(function(sum, num){ return sum + num; }, 0);
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equal(sum, 6, 'OO-style reduce');
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var sum = _.reduce([1, 2, 3], function(sum, num){ return sum + num; });
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equal(sum, 6, 'default initial value');
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var ifnull;
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try {
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_.reduce(null, function(){});
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} catch (ex) {
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ifnull = ex;
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}
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ok(ifnull instanceof TypeError, 'handles a null (without inital value) properly');
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ok(_.reduce(null, function(){}, 138) === 138, 'handles a null (with initial value) properly');
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equal(_.reduce([], function(){}, undefined), undefined, 'undefined can be passed as a special case');
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raises(function() { _.reduce([], function(){}); }, TypeError, 'throws an error for empty arrays with no initial value');
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var sparseArray = [];
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sparseArray[0] = 20;
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sparseArray[2] = -5;
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equal(_.reduce(sparseArray, function(a, b){ return a - b; }), 25, 'initially-sparse arrays with no memo');
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});
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test('collections: reduceRight', function() {
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var list = _.reduceRight(["foo", "bar", "baz"], function(memo, str){ return memo + str; }, '');
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equal(list, 'bazbarfoo', 'can perform right folds');
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var list = _.foldr(["foo", "bar", "baz"], function(memo, str){ return memo + str; }, '');
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equal(list, 'bazbarfoo', 'aliased as "foldr"');
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var list = _.foldr(["foo", "bar", "baz"], function(memo, str){ return memo + str; });
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equal(list, 'bazbarfoo', 'default initial value');
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var ifnull;
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try {
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_.reduceRight(null, function(){});
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} catch (ex) {
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ifnull = ex;
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}
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ok(ifnull instanceof TypeError, 'handles a null (without inital value) properly');
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ok(_.reduceRight(null, function(){}, 138) === 138, 'handles a null (with initial value) properly');
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equal(_.reduceRight([], function(){}, undefined), undefined, 'undefined can be passed as a special case');
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raises(function() { _.reduceRight([], function(){}); }, TypeError, 'throws an error for empty arrays with no initial value');
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var sparseArray = [];
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sparseArray[0] = 20;
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sparseArray[2] = -5;
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equal(_.reduceRight(sparseArray, function(a, b){ return a - b; }), -25, 'initially-sparse arrays with no memo');
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});
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test('collections: detect', function() {
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var result = _.detect([1, 2, 3], function(num){ return num * 2 == 4; });
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equal(result, 2, 'found the first "2" and broke the loop');
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});
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test('collections: select', function() {
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var evens = _.select([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; });
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equal(evens.join(', '), '2, 4, 6', 'selected each even number');
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evens = _.filter([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; });
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equal(evens.join(', '), '2, 4, 6', 'aliased as "filter"');
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});
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test('collections: reject', function() {
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var odds = _.reject([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; });
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equal(odds.join(', '), '1, 3, 5', 'rejected each even number');
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});
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test('collections: all', function() {
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ok(_.all([], _.identity), 'the empty set');
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ok(_.all([true, true, true], _.identity), 'all true values');
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ok(!_.all([true, false, true], _.identity), 'one false value');
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ok(_.all([0, 10, 28], function(num){ return num % 2 == 0; }), 'even numbers');
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ok(!_.all([0, 11, 28], function(num){ return num % 2 == 0; }), 'an odd number');
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ok(_.all([1], _.identity) === true, 'cast to boolean - true');
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ok(_.all([0], _.identity) === false, 'cast to boolean - false');
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ok(_.every([true, true, true], _.identity), 'aliased as "every"');
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});
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test('collections: any', function() {
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var nativeSome = Array.prototype.some;
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Array.prototype.some = null;
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ok(!_.any([]), 'the empty set');
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ok(!_.any([false, false, false]), 'all false values');
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ok(_.any([false, false, true]), 'one true value');
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ok(_.any([null, 0, 'yes', false]), 'a string');
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ok(!_.any([null, 0, '', false]), 'falsy values');
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ok(!_.any([1, 11, 29], function(num){ return num % 2 == 0; }), 'all odd numbers');
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ok(_.any([1, 10, 29], function(num){ return num % 2 == 0; }), 'an even number');
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ok(_.any([1], _.identity) === true, 'cast to boolean - true');
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ok(_.any([0], _.identity) === false, 'cast to boolean - false');
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ok(_.some([false, false, true]), 'aliased as "some"');
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Array.prototype.some = nativeSome;
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});
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test('collections: include', function() {
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ok(_.include([1,2,3], 2), 'two is in the array');
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ok(!_.include([1,3,9], 2), 'two is not in the array');
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ok(_.contains({moe:1, larry:3, curly:9}, 3) === true, '_.include on objects checks their values');
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ok(_([1,2,3]).include(2), 'OO-style include');
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});
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test('collections: invoke', function() {
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var list = [[5, 1, 7], [3, 2, 1]];
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var result = _.invoke(list, 'sort');
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equal(result[0].join(', '), '1, 5, 7', 'first array sorted');
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equal(result[1].join(', '), '1, 2, 3', 'second array sorted');
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});
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test('collections: invoke w/ function reference', function() {
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var list = [[5, 1, 7], [3, 2, 1]];
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var result = _.invoke(list, Array.prototype.sort);
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equal(result[0].join(', '), '1, 5, 7', 'first array sorted');
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equal(result[1].join(', '), '1, 2, 3', 'second array sorted');
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});
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// Relevant when using ClojureScript
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test('collections: invoke when strings have a call method', function() {
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String.prototype.call = function() {
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return 42;
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};
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var list = [[5, 1, 7], [3, 2, 1]];
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var s = "foo";
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equal(s.call(), 42, "call function exists");
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var result = _.invoke(list, 'sort');
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equal(result[0].join(', '), '1, 5, 7', 'first array sorted');
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equal(result[1].join(', '), '1, 2, 3', 'second array sorted');
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delete String.prototype.call;
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equal(s.call, undefined, "call function removed");
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});
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test('collections: pluck', function() {
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var people = [{name : 'moe', age : 30}, {name : 'curly', age : 50}];
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equal(_.pluck(people, 'name').join(', '), 'moe, curly', 'pulls names out of objects');
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});
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test('collections: max', function() {
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equal(3, _.max([1, 2, 3]), 'can perform a regular Math.max');
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var neg = _.max([1, 2, 3], function(num){ return -num; });
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equal(neg, 1, 'can perform a computation-based max');
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equal(-Infinity, _.max({}), 'Maximum value of an empty object');
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equal(-Infinity, _.max([]), 'Maximum value of an empty array');
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});
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test('collections: min', function() {
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equal(1, _.min([1, 2, 3]), 'can perform a regular Math.min');
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var neg = _.min([1, 2, 3], function(num){ return -num; });
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equal(neg, 3, 'can perform a computation-based min');
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equal(Infinity, _.min({}), 'Minimum value of an empty object');
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equal(Infinity, _.min([]), 'Minimum value of an empty array');
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var now = new Date(9999999999);
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var then = new Date(0);
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equal(_.min([now, then]), then);
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});
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test('collections: sortBy', function() {
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var people = [{name : 'curly', age : 50}, {name : 'moe', age : 30}];
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people = _.sortBy(people, function(person){ return person.age; });
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equal(_.pluck(people, 'name').join(', '), 'moe, curly', 'stooges sorted by age');
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var list = [undefined, 4, 1, undefined, 3, 2];
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equal(_.sortBy(list, _.identity).join(','), '1,2,3,4,,', 'sortBy with undefined values');
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var list = ["one", "two", "three", "four", "five"];
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var sorted = _.sortBy(list, 'length');
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equal(sorted.join(' '), 'one two four five three', 'sorted by length');
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});
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test('collections: groupBy', function() {
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var parity = _.groupBy([1, 2, 3, 4, 5, 6], function(num){ return num % 2; });
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ok('0' in parity && '1' in parity, 'created a group for each value');
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equal(parity[0].join(', '), '2, 4, 6', 'put each even number in the right group');
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var list = ["one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten"];
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var grouped = _.groupBy(list, 'length');
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equal(grouped['3'].join(' '), 'one two six ten');
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equal(grouped['4'].join(' '), 'four five nine');
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equal(grouped['5'].join(' '), 'three seven eight');
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});
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test('collections: sortedIndex', function() {
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var numbers = [10, 20, 30, 40, 50], num = 35;
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var indexForNum = _.sortedIndex(numbers, num);
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equal(indexForNum, 3, '35 should be inserted at index 3');
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var indexFor30 = _.sortedIndex(numbers, 30);
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equal(indexFor30, 2, '30 should be inserted at index 2');
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});
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test('collections: shuffle', function() {
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var numbers = _.range(10);
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var shuffled = _.shuffle(numbers).sort();
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notStrictEqual(numbers, shuffled, 'original object is unmodified');
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equal(shuffled.join(','), numbers.join(','), 'contains the same members before and after shuffle');
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});
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test('collections: toArray', function() {
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ok(!_.isArray(arguments), 'arguments object is not an array');
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ok(_.isArray(_.toArray(arguments)), 'arguments object converted into array');
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var a = [1,2,3];
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ok(_.toArray(a) !== a, 'array is cloned');
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equal(_.toArray(a).join(', '), '1, 2, 3', 'cloned array contains same elements');
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var numbers = _.toArray({one : 1, two : 2, three : 3});
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equal(numbers.join(', '), '1, 2, 3', 'object flattened into array');
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var objectWithToArrayFunction = {toArray: function() {
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return [1, 2, 3];
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}};
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equal(_.toArray(objectWithToArrayFunction).join(', '), '1, 2, 3', 'toArray method used if present');
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var objectWithToArrayValue = {toArray: 1};
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equal(_.toArray(objectWithToArrayValue).join(', '), '1', 'toArray property ignored if not a function');
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});
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test('collections: size', function() {
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equal(_.size({one : 1, two : 2, three : 3}), 3, 'can compute the size of an object');
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equal(_.size([1, 2, 3]), 3, 'can compute the size of an array');
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});
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});
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