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functions.js
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functions.js
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$(document).ready(function() {
module("Function functions (bind, bindAll, and so on...)");
test("functions: bind", function() {
var context = {name : 'moe'};
var func = function(arg) { return "name: " + (this.name || arg); };
var bound = _.bind(func, context);
equals(bound(), 'name: moe', 'can bind a function to a context');
bound = _(func).bind(context);
equals(bound(), 'name: moe', 'can do OO-style binding');
bound = _.bind(func, null, 'curly');
equals(bound(), 'name: curly', 'can bind without specifying a context');
func = function(salutation, name) { return salutation + ': ' + name; };
func = _.bind(func, this, 'hello');
equals(func('moe'), 'hello: moe', 'the function was partially applied in advance');
var func = _.bind(func, this, 'curly');
equals(func(), 'hello: curly', 'the function was completely applied in advance');
});
test("functions: bindAll", function() {
var curly = {name : 'curly'}, moe = {
name : 'moe',
getName : function() { return 'name: ' + this.name; },
sayHi : function() { return 'hi: ' + this.name; }
};
curly.getName = moe.getName;
_.bindAll('getName', 'sayHi', moe);
curly.sayHi = moe.sayHi;
equals(curly.getName(), 'name: curly', 'unbound function is bound to current object');
equals(curly.sayHi(), 'hi: moe', 'bound function is still bound to original object');
});
asyncTest("functions: delay", function() {
var delayed = false;
_.delay(function(){ delayed = true; }, 100);
_.delay(function(){ ok(!delayed, "didn't delay the function quite yet"); }, 50);
_.delay(function(){ ok(delayed, 'delayed the function'); start(); }, 150);
});
asyncTest("functions: defer", function() {
var deferred = false;
_.defer(function(bool){ deferred = bool; }, true);
_.delay(function(){ ok(deferred, "deferred the function"); start(); }, 50);
});
test("functions: wrap", function() {
var greet = function(name){ return "hi: " + name; };
var backwards = _.wrap(greet, function(func, name){ return func(name) + ' ' + name.split('').reverse().join(''); });
equals(backwards('moe'), 'hi: moe eom', 'wrapped the saluation function');
});
test("functions: compose", function() {
var greet = function(name){ return "hi: " + name; };
var exclaim = function(sentence){ return sentence + '!'; };
var composed = _.compose(exclaim, greet);
equals(composed('moe'), 'hi: moe!', 'can compose a function that takes another');
composed = _.compose(greet, exclaim);
equals(composed('moe'), 'hi: moe!', 'in this case, the functions are also commutative');
});
});