260 lines
9.7 KiB
JavaScript
260 lines
9.7 KiB
JavaScript
$(document).ready(function() {
|
|
|
|
module("Functions");
|
|
|
|
test("bind", function() {
|
|
var context = {name : 'moe'};
|
|
var func = function(arg) { return "name: " + (this.name || arg); };
|
|
var bound = _.bind(func, context);
|
|
equal(bound(), 'name: moe', 'can bind a function to a context');
|
|
|
|
bound = _(func).bind(context);
|
|
equal(bound(), 'name: moe', 'can do OO-style binding');
|
|
|
|
bound = _.bind(func, null, 'curly');
|
|
equal(bound(), 'name: curly', 'can bind without specifying a context');
|
|
|
|
func = function(salutation, name) { return salutation + ': ' + name; };
|
|
func = _.bind(func, this, 'hello');
|
|
equal(func('moe'), 'hello: moe', 'the function was partially applied in advance');
|
|
|
|
var func = _.bind(func, this, 'curly');
|
|
equal(func(), 'hello: curly', 'the function was completely applied in advance');
|
|
|
|
var func = function(salutation, firstname, lastname) { return salutation + ': ' + firstname + ' ' + lastname; };
|
|
func = _.bind(func, this, 'hello', 'moe', 'curly');
|
|
equal(func(), 'hello: moe curly', 'the function was partially applied in advance and can accept multiple arguments');
|
|
|
|
func = function(context, message) { equal(this, context, message); };
|
|
_.bind(func, 0, 0, 'can bind a function to `0`')();
|
|
_.bind(func, '', '', 'can bind a function to an empty string')();
|
|
_.bind(func, false, false, 'can bind a function to `false`')();
|
|
|
|
// These tests are only meaningful when using a browser without a native bind function
|
|
// To test this with a modern browser, set underscore's nativeBind to undefined
|
|
var F = function () { return this; };
|
|
var Boundf = _.bind(F, {hello: "moe curly"});
|
|
equal(new Boundf().hello, undefined, "function should not be bound to the context, to comply with ECMAScript 5");
|
|
equal(Boundf().hello, "moe curly", "When called without the new operator, it's OK to be bound to the context");
|
|
});
|
|
|
|
test("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(moe, 'getName', 'sayHi');
|
|
curly.sayHi = moe.sayHi;
|
|
equal(curly.getName(), 'name: curly', 'unbound function is bound to current object');
|
|
equal(curly.sayHi(), 'hi: moe', 'bound function is still bound to original object');
|
|
|
|
curly = {name : 'curly'};
|
|
moe = {
|
|
name : 'moe',
|
|
getName : function() { return 'name: ' + this.name; },
|
|
sayHi : function() { return 'hi: ' + this.name; }
|
|
};
|
|
_.bindAll(moe);
|
|
curly.sayHi = moe.sayHi;
|
|
equal(curly.sayHi(), 'hi: moe', 'calling bindAll with no arguments binds all functions to the object');
|
|
});
|
|
|
|
test("memoize", function() {
|
|
var fib = function(n) {
|
|
return n < 2 ? n : fib(n - 1) + fib(n - 2);
|
|
};
|
|
var fastFib = _.memoize(fib);
|
|
equal(fib(10), 55, 'a memoized version of fibonacci produces identical results');
|
|
equal(fastFib(10), 55, 'a memoized version of fibonacci produces identical results');
|
|
|
|
var o = function(str) {
|
|
return str;
|
|
};
|
|
var fastO = _.memoize(o);
|
|
equal(o('toString'), 'toString', 'checks hasOwnProperty');
|
|
equal(fastO('toString'), 'toString', 'checks hasOwnProperty');
|
|
});
|
|
|
|
asyncTest("delay", 2, function() {
|
|
var delayed = false;
|
|
_.delay(function(){ delayed = true; }, 100);
|
|
setTimeout(function(){ ok(!delayed, "didn't delay the function quite yet"); }, 50);
|
|
setTimeout(function(){ ok(delayed, 'delayed the function'); start(); }, 150);
|
|
});
|
|
|
|
asyncTest("defer", 1, function() {
|
|
var deferred = false;
|
|
_.defer(function(bool){ deferred = bool; }, true);
|
|
_.delay(function(){ ok(deferred, "deferred the function"); start(); }, 50);
|
|
});
|
|
|
|
asyncTest("throttle", 2, function() {
|
|
var counter = 0;
|
|
var incr = function(){ counter++; };
|
|
var throttledIncr = _.throttle(incr, 100);
|
|
throttledIncr(); throttledIncr(); throttledIncr();
|
|
setTimeout(throttledIncr, 70);
|
|
setTimeout(throttledIncr, 120);
|
|
setTimeout(throttledIncr, 140);
|
|
setTimeout(throttledIncr, 190);
|
|
setTimeout(throttledIncr, 220);
|
|
setTimeout(throttledIncr, 240);
|
|
_.delay(function(){ equal(counter, 1, "incr was called immediately"); }, 30);
|
|
_.delay(function(){ equal(counter, 4, "incr was throttled"); start(); }, 400);
|
|
});
|
|
|
|
asyncTest("throttle arguments", 2, function() {
|
|
var value = 0;
|
|
var update = function(val){ value = val; };
|
|
var throttledUpdate = _.throttle(update, 100);
|
|
throttledUpdate(1); throttledUpdate(2); throttledUpdate(3);
|
|
setTimeout(function(){ throttledUpdate(4); }, 120);
|
|
setTimeout(function(){ throttledUpdate(5); }, 140);
|
|
setTimeout(function(){ throttledUpdate(6); }, 250);
|
|
_.delay(function(){ equal(value, 1, "updated to latest value"); }, 40);
|
|
_.delay(function(){ equal(value, 6, "updated to latest value"); start(); }, 400);
|
|
});
|
|
|
|
asyncTest("throttle once", 2, function() {
|
|
var counter = 0;
|
|
var incr = function(){ return ++counter; };
|
|
var throttledIncr = _.throttle(incr, 100);
|
|
var result = throttledIncr();
|
|
_.delay(function(){
|
|
equal(result, 1, "throttled functions return their value");
|
|
equal(counter, 1, "incr was called once"); start();
|
|
}, 220);
|
|
});
|
|
|
|
asyncTest("throttle twice", 1, function() {
|
|
var counter = 0;
|
|
var incr = function(){ counter++; };
|
|
var throttledIncr = _.throttle(incr, 100);
|
|
throttledIncr(); throttledIncr();
|
|
_.delay(function(){ equal(counter, 2, "incr was called twice"); start(); }, 220);
|
|
});
|
|
|
|
asyncTest("throttle repeatedly with results", 9, function() {
|
|
var counter = 0;
|
|
var incr = function(){ return ++counter; };
|
|
var throttledIncr = _.throttle(incr, 100);
|
|
var results = [];
|
|
var saveResult = function() { results.push(throttledIncr()); };
|
|
saveResult(); saveResult(); saveResult();
|
|
setTimeout(saveResult, 70);
|
|
setTimeout(saveResult, 120);
|
|
setTimeout(saveResult, 140);
|
|
setTimeout(saveResult, 190);
|
|
setTimeout(saveResult, 240);
|
|
setTimeout(saveResult, 260);
|
|
_.delay(function() {
|
|
equal(results[0], 1, "incr was called once");
|
|
equal(results[1], 1, "incr was throttled");
|
|
equal(results[2], 1, "incr was throttled");
|
|
equal(results[3], 1, "incr was throttled");
|
|
equal(results[4], 2, "incr was called twice");
|
|
equal(results[5], 2, "incr was throttled");
|
|
equal(results[6], 2, "incr was throttled");
|
|
equal(results[7], 3, "incr was called thrice");
|
|
equal(results[8], 3, "incr was throttled");
|
|
start();
|
|
}, 400);
|
|
});
|
|
|
|
asyncTest("debounce", 1, function() {
|
|
var counter = 0;
|
|
var incr = function(){ counter++; };
|
|
var debouncedIncr = _.debounce(incr, 50);
|
|
debouncedIncr(); debouncedIncr(); debouncedIncr();
|
|
setTimeout(debouncedIncr, 30);
|
|
setTimeout(debouncedIncr, 60);
|
|
setTimeout(debouncedIncr, 90);
|
|
setTimeout(debouncedIncr, 120);
|
|
setTimeout(debouncedIncr, 150);
|
|
_.delay(function(){ equal(counter, 1, "incr was debounced"); start(); }, 220);
|
|
});
|
|
|
|
asyncTest("debounce asap", 5, function() {
|
|
var a, b, c;
|
|
var counter = 0;
|
|
var incr = function(){ return ++counter; };
|
|
var debouncedIncr = _.debounce(incr, 50, true);
|
|
a = debouncedIncr();
|
|
b = debouncedIncr();
|
|
c = debouncedIncr();
|
|
equal(a, 1);
|
|
equal(b, 1);
|
|
equal(c, 1);
|
|
equal(counter, 1, 'incr was called immediately');
|
|
setTimeout(debouncedIncr, 30);
|
|
setTimeout(debouncedIncr, 60);
|
|
setTimeout(debouncedIncr, 90);
|
|
setTimeout(debouncedIncr, 120);
|
|
setTimeout(debouncedIncr, 150);
|
|
_.delay(function(){ equal(counter, 1, "incr was debounced"); start(); }, 220);
|
|
});
|
|
|
|
asyncTest("debounce asap recursively", 2, function() {
|
|
var counter = 0;
|
|
var debouncedIncr = _.debounce(function(){
|
|
counter++;
|
|
if (counter < 5) debouncedIncr();
|
|
}, 50, true);
|
|
debouncedIncr();
|
|
equal(counter, 1, 'incr was called immediately');
|
|
_.delay(function(){ equal(counter, 1, "incr was debounced"); start(); }, 70);
|
|
});
|
|
|
|
test("once", function() {
|
|
var num = 0;
|
|
var increment = _.once(function(){ num++; });
|
|
increment();
|
|
increment();
|
|
equal(num, 1);
|
|
});
|
|
|
|
test("wrap", function() {
|
|
var greet = function(name){ return "hi: " + name; };
|
|
var backwards = _.wrap(greet, function(func, name){ return func(name) + ' ' + name.split('').reverse().join(''); });
|
|
equal(backwards('moe'), 'hi: moe eom', 'wrapped the saluation function');
|
|
|
|
var inner = function(){ return "Hello "; };
|
|
var obj = {name : "Moe"};
|
|
obj.hi = _.wrap(inner, function(fn){ return fn() + this.name; });
|
|
equal(obj.hi(), "Hello Moe");
|
|
|
|
var noop = function(){};
|
|
var wrapped = _.wrap(noop, function(fn){ return Array.prototype.slice.call(arguments, 0); });
|
|
var ret = wrapped(['whats', 'your'], 'vector', 'victor');
|
|
deepEqual(ret, [noop, ['whats', 'your'], 'vector', 'victor']);
|
|
});
|
|
|
|
test("compose", function() {
|
|
var greet = function(name){ return "hi: " + name; };
|
|
var exclaim = function(sentence){ return sentence + '!'; };
|
|
var composed = _.compose(exclaim, greet);
|
|
equal(composed('moe'), 'hi: moe!', 'can compose a function that takes another');
|
|
|
|
composed = _.compose(greet, exclaim);
|
|
equal(composed('moe'), 'hi: moe!', 'in this case, the functions are also commutative');
|
|
});
|
|
|
|
test("after", function() {
|
|
var testAfter = function(afterAmount, timesCalled) {
|
|
var afterCalled = 0;
|
|
var after = _.after(afterAmount, function() {
|
|
afterCalled++;
|
|
});
|
|
while (timesCalled--) after();
|
|
return afterCalled;
|
|
};
|
|
|
|
equal(testAfter(5, 5), 1, "after(N) should fire after being called N times");
|
|
equal(testAfter(5, 4), 0, "after(N) should not fire unless called N times");
|
|
equal(testAfter(0, 0), 1, "after(0) should fire immediately");
|
|
});
|
|
|
|
});
|