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underscore_spec.js
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/*
* The MIT License (MIT)
*
* Copyright (c) 2014 Valentyn Kolesnikov
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
describe("underscore tests",function(){
/*
_.each([1, 2, 3], alert);
=> alerts each number in turn...
*/
it("each",function(){
var result = [];
_.each([1, 2, 3], function(item) {result.push(item)});
expect(result).toEqual([1, 2, 3]);
});
/*
_.each({one: 1, two: 2, three: 3}, alert);
=> alerts each number value in turn...
*/
it("eachMap",function(){
var result = [];
_.each({one: 1, two: 2, three: 3}, function(item) {result.push(item)});
expect(result).toEqual([1, 2, 3]);
});
/*
_.map([1, 2, 3], function(num){ return num * 3; });
=> [3, 6, 9]
*/
it("map",function(){
var result = _.map([1, 2, 3], function(num){ return num * 3; });
expect(result).toEqual([3, 6, 9]);
});
/*
_.map({one: 1, two: 2, three: 3}, function(num, key){ return num * 3; });
=> [3, 6, 9]
*/
it("mapMap",function(){
var result = _.map({one: 1, two: 2, three: 3}, function(num){ return num * 3; });
expect(result).toEqual([3, 6, 9]);
});
/*
var sum = _.reduce([1, 2, 3], function(memo, num){ return memo + num; }, 0);
=> 6
*/
it("reduce",function(){
var sum = _.reduce([1, 2, 3], function(memo, num){ return memo + num; }, 0);
expect(sum).toEqual(6);
});
/*
var list = [[0, 1], [2, 3], [4, 5]];
var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []);
=> [4, 5, 2, 3, 0, 1]
*/
it("reduceRight",function(){
var list = [[0, 1], [2, 3], [4, 5]];
var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []);
expect(flat).toEqual([4, 5, 2, 3, 0, 1]);
});
/*
var list = [[0, 1], [2, 3], [4, 5]];
var flat = _.foldl(list, function(a, b) { return a.concat(b); }, []);
=> [0, 1, 2, 3, 4, 5]
*/
it("foldl",function(){
var list = [[0, 1], [2, 3], [4, 5]];
var flat = _.foldl(list, function(a, b) { return a.concat(b); }, []);
expect(flat).toEqual([0, 1, 2, 3, 4, 5]);
});
/*
var list = [[0, 1], [2, 3], [4, 5]];
var flat = _.foldr(list, function(a, b) { return a.concat(b); }, []);
=> [4, 5, 2, 3, 0, 1]
*/
it("foldr",function(){
var list = [[0, 1], [2, 3], [4, 5]];
var flat = _.foldr(list, function(a, b) { return a.concat(b); }, []);
expect(flat).toEqual([4, 5, 2, 3, 0, 1]);
});
/*
_.contains([1, 2, 3], 3);
=> true
*/
it("contains",function(){
expect(_.contains([1, 2, 3], 3)).toBe(true);
});
/*
var even = _.find([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; });
=> 2
*/
it("find",function(){
expect(_.find([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; })).toBe(2);
});
/*
var evens = _.filter([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; });
=> [2, 4, 6]
*/
it("filter",function(){
expect(_.filter([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; })).toEqual([2, 4, 6]);
});
/*
_.where(listOfPlays, {author: "Shakespeare", year: 1611});
=> [{title: "Cymbeline", author: "Shakespeare", year: 1611},
{title: "The Tempest", author: "Shakespeare", year: 1611}]
*/
it("where",function(){
var listOfPlays =
[{title: "Cymbeline2", author: "Shakespeare", year: 1614},
{title: "Cymbeline", author: "Shakespeare", year: 1611},
{title: "The Tempest", author: "Shakespeare", year: 1611}]
expect(_.where(listOfPlays, {author: "Shakespeare", year: 1611})).toEqual(
[{title: "Cymbeline", author: "Shakespeare", year: 1611},
{title: "The Tempest", author: "Shakespeare", year: 1611}]);
});
/*
_.first([5, 4, 3, 2, 1]);
=> 5
*/
it("first",function(){
expect(_.first([5, 4, 3, 2, 1])).toBe(5);
});
/*
_.initial([5, 4, 3, 2, 1]);
=> [5, 4, 3, 2]
*/
it("initial",function(){
expect(_.initial([5, 4, 3, 2, 1])).toEqual([5, 4, 3, 2]);
});
/*
_.last([5, 4, 3, 2, 1]);
=> 1
*/
it("last",function(){
expect(_.last([5, 4, 3, 2, 1])).toBe(1);
});
/*
_.flatten([1, [2], [3, [[4]]]]);
=> [1, 2, 3, 4];
*/
it("flatten",function(){
expect(_.flatten([1, [2], [3, [[4]]]])).toEqual([1, 2, 3, 4]);
});
/*
_.compact([0, 1, false, 2, '', 3]);
=> [1, 2, 3]
*/
it("compact",function(){
expect(_.compact([0, 1, false, 2, '', 3])).toEqual([1, 2, 3]);
});
/*
_.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
=> [2, 3, 4]
*/
it("without",function(){
expect(_.without([1, 2, 1, 0, 3, 1, 4], 0, 1)).toEqual([2, 3, 4]);
});
/*
var numbers = [10, 5, 100, 2, 1000];
_.max(numbers);
=> 1000
*/
it("max",function(){
expect(_.max([10, 5, 100, 2, 1000])).toBe(1000);
});
/*
var numbers = [10, 5, 100, 2, 1000];
_.min(numbers);
=> 2
*/
it("min",function(){
expect(_.min([10, 5, 100, 2, 1000])).toBe(2);
});
/*
_.shuffle([1, 2, 3, 4, 5, 6]);
=> [4, 1, 6, 3, 5, 2]
*/
it("shuffle",function(){
expect(_.shuffle([1, 2, 3, 4, 5, 6]).length).toBe(6);
expect(_.shuffle([1, 2, 3, 4, 5, 6]).sort()).toEqual([1, 2, 3, 4, 5, 6]);
});
/*
_.sample([1, 2, 3, 4, 5, 6]);
=> 4
_.sample([1, 2, 3, 4, 5, 6], 3);
=> [1, 6, 2]
*/
it("sample",function(){
expect(_.sample([1, 2, 3, 4, 5, 6], 3).length).toBe(3);
});
/*
var stooges = [{name: 'moe', age: 40}, {name: 'larry', age: 50}, {name: 'curly', age: 60}];
_.pluck(stooges, 'name');
=> ["moe", "larry", "curly"]
*/
it("pluck",function(){
var stooges = [{name: 'moe', age: 40}, {name: 'larry', age: 50}, {name: 'curly', age: 60}];
expect(_.pluck(stooges, 'name')).toEqual(["moe", "larry", "curly"]);
});
/*
_.sortBy([1, 2, 3, 4, 5, 6], function(num){ return Math.sin(num); });
=> [5, 4, 6, 3, 1, 2]
*/
it("sortBy",function(){
expect(_.sortBy([1, 2, 3, 4, 5, 6], function(num){ return Math.sin(num); })).toEqual([5, 4, 6, 3, 1, 2]);
});
/*
_.groupBy([1.3, 2.1, 2.4], function(num){ return Math.floor(num); });
=> {1: [1.3], 2: [2.1, 2.4]}
*/
it("groupBy",function(){
expect(_.groupBy([1.3, 2.1, 2.4], function(num){ return Math.floor(num); })).toEqual({1: [1.3], 2: [2.1, 2.4]});
});
/*
var stooges = [{name: 'moe', age: 40}, {name: 'larry', age: 50}, {name: 'curly', age: 60}];
_.indexBy(stooges, 'age');
=> {
"40": {name: 'moe', age: 40},
"50": {name: 'larry', age: 50},
"60": {name: 'curly', age: 60}
}
*/
it("indexBy",function(){
var stooges = [{name: 'moe', age: 40}, {name: 'larry', age: 50}, {name: 'curly', age: 60}];
expect(_.indexBy(stooges, 'age')).toEqual(
{
"40": {name: 'moe', age: 40},
"50": {name: 'larry', age: 50},
"60": {name: 'curly', age: 60}
});
});
/*
(function(){ return _.toArray(arguments).slice(1); })(1, 2, 3, 4);
=> [2, 3, 4]
*/
it("toArray",function(){
expect((function(){ return _.toArray(arguments).slice(1); })(1, 2, 3, 4)).toEqual([2, 3, 4]);
});
/*
_.size({one: 1, two: 2, three: 3});
=> 3
*/
it("size",function(){
expect(_.size({one: 1, two: 2, three: 3})).toBe(3);
});
/*
_.union([1, 2, 3], [101, 2, 1, 10], [2, 1]);
=> [1, 2, 3, 101, 10]
*/
it("union",function(){
expect(_.union([1, 2, 3], [101, 2, 1, 10], [2, 1])).toEqual([1, 2, 3, 101, 10]);
});
/*
_.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]);
=> [1, 2]
*/
it("intersection",function(){
expect(_.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1])).toEqual([1, 2]);
});
/*
_.difference([1, 2, 3, 4, 5], [5, 2, 10]);
=> [1, 3, 4]
*/
it("difference",function(){
expect(_.difference([1, 2, 3, 4, 5], [5, 2, 10])).toEqual([1, 3, 4]);
});
/*
_.uniq([1, 2, 1, 3, 1, 4]);
=> [1, 2, 3, 4]
*/
it("uniq",function(){
expect(_.uniq([1, 2, 1, 3, 1, 4])).toEqual([1, 2, 3, 4]);
});
/*
_.zip(['moe', 'larry', 'curly'], [30, 40, 50], [true, false, false]);
=> [["moe", 30, true], ["larry", 40, false], ["curly", 50, false]]
*/
it("zip",function(){
expect(_.zip(['moe', 'larry', 'curly'], [30, 40, 50], [true, false, false])).toEqual(
[["moe", 30, true], ["larry", 40, false], ["curly", 50, false]]);
});
/*
_.object(['moe', 'larry', 'curly'], [30, 40, 50]);
=> {moe: 30, larry: 40, curly: 50}
*/
it("object",function(){
expect(_.object(['moe', 'larry', 'curly'], [30, 40, 50])).toEqual(
{moe: 30, larry: 40, curly: 50});
});
/*
_.indexOf([1, 2, 3], 2);
=> 1
*/
it("indexOf",function(){
expect(_.indexOf([1, 2, 3], 2)).toBe(1);
});
/*
_.lastIndexOf([1, 2, 3, 1, 2, 3], 2);
=> 4
*/
it("lastIndexOf",function(){
expect(_.lastIndexOf([1, 2, 3, 1, 2, 3], 2)).toBe(4);
});
/*
_.sortedIndex([10, 20, 30, 40, 50], 35);
=> 3
*/
it("sortedIndex",function(){
expect(_.sortedIndex([10, 20, 30, 40, 50], 35)).toBe(3);
});
/*
_.range(10);
=> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
_.range(1, 11);
=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
_.range(0, 30, 5);
=> [0, 5, 10, 15, 20, 25]
_.range(0, -10, -1);
=> [0, -1, -2, -3, -4, -5, -6, -7, -8, -9]
_.range(0);
=> []
*/
it("range",function(){
expect(_.range(10)).toEqual([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
expect(_.range(1, 11)).toEqual([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
expect(_.range(0, 30, 5)).toEqual([0, 5, 10, 15, 20, 25]);
expect(_.range(0, -10, -1)).toEqual([0, -1, -2, -3, -4, -5, -6, -7, -8, -9]);
expect(_.range(0)).toEqual([]);
});
/*
var stooges = [{name: 'curly', age: 25}, {name: 'moe', age: 21}, {name: 'larry', age: 23}];
var youngest = _.chain(stooges)
.sortBy(function(stooge){ return stooge.age; })
.map(function(stooge){ return stooge.name + ' is ' + stooge.age; })
.first()
.value();
=> "moe is 21"
*/
it("chain",function(){
var stooges = [{name: 'curly', age: 25}, {name: 'moe', age: 21}, {name: 'larry', age: 23}];
var youngest = _.chain(stooges)
.sortBy(function(stooge){ return stooge.age; })
.map(function(stooge){ return stooge.name + ' is ' + stooge.age; })
.first()
.value();
expect(youngest).toBe("moe is 21");
});
/*
var compiled = _.template("hello: <%= name %>");
compiled({name: 'moe'});
=> "hello: moe"
*/
it("template",function(){
var compiled = _.template("hello: <%= name %>");
expect(compiled({name: 'moe'})).toBe("hello: moe");
});
/*
var list = "<% _.each(people, function(name) { %> <li><%= name %></li> <% }); %>";
_.template(list, {people: ['moe', 'curly', 'larry']});
=> "<li>moe</li><li>curly</li><li>larry</li>"
*/
it("template each",function(){
var list = "<% _.each(people, function(name) { %> <li><%= name %></li> <% }); %>";
expect(_.template(list)({people: ['moe', 'curly', 'larry']})).toBe(
" <li>moe</li> <li>curly</li> <li>larry</li> ");
});
/*
var template = _.template("<b><%- value %></b>");
template({value: '<script>'});
=> "<b><script></b>"
*/
it("template value",function(){
var template = _.template("<b><%- value %></b>");
expect(template({value: '<script>'})).toBe("<b><script></b>");
});
/*
var compiled = _.template("<% print('Hello ' + epithet); %>");
compiled({epithet: "stooge"});
=> "Hello stooge"
*/
it("template print",function(){
var compiled = _.template("<% print('Hello ' + epithet); %>");
expect(compiled({epithet: "stooge"})).toBe("Hello stooge");
});
/*
var lyrics = [
{line: 1, words: "I'm a lumberjack and I'm okay"},
{line: 2, words: "I sleep all night and I work all day"},
{line: 3, words: "He's a lumberjack and he's okay"},
{line: 4, words: "He sleeps all night and he works all day"}
];
_.chain(lyrics)
.map(function(line) { return line.words.split(' '); })
.flatten()
.reduce(function(counts, word) {
counts[word] = (counts[word] || 0) + 1;
return counts;
}, {})
.value();
=> {lumberjack: 2, all: 4, night: 2 ... }
*/
it("chain",function(){
var lyrics = [
{line: 1, words: "I'm a lumberjack and I'm okay"},
{line: 2, words: "I sleep all night and I work all day"},
{line: 3, words: "He's a lumberjack and he's okay"},
{line: 4, words: "He sleeps all night and he works all day"}
];
var result = _.chain(lyrics)
.map(function(line) { return line.words.split(' '); })
.flatten()
.reduce(function(counts, word) {
counts[word] = (counts[word] || 0) + 1;
return counts;
}, {})
.value();
expect(result).toEqual(
{ "I'm" : 2, a : 2, lumberjack : 2, and : 4, okay : 2, I : 2, sleep : 1, all : 4,
night : 2, work : 1, day : 2, "He's" : 1, "he's" : 1, He : 1, sleeps : 1, he : 1,
works : 1 });
});
});