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Initial draft of _.throttle and _.debounce

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This commit is contained in:
Jeremy Ashkenas
2010-11-30 11:41:48 -05:00
parent 6763b06192
commit 9e3e067f50
3 changed files with 54 additions and 11 deletions
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29
test/functions.js
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@@ -54,19 +54,44 @@ $(document).ready(function() {
equals(fastFib(10), 55, 'a memoized version of fibonacci produces identical results');
});
asyncTest("functions: delay", function() {
asyncTest("functions: delay", 2, 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() {
asyncTest("functions: defer", 1, function() {
var deferred = false;
_.defer(function(bool){ deferred = bool; }, true);
_.delay(function(){ ok(deferred, "deferred the function"); start(); }, 50);
});
asyncTest("functions: throttle", 1, function() {
var counter = 0;
var incr = function(){ counter++; };
var throttledIncr = _.throttle(incr, 50);
throttledIncr(); throttledIncr(); throttledIncr();
setTimeout(throttledIncr, 60);
setTimeout(throttledIncr, 70);
setTimeout(throttledIncr, 110);
setTimeout(throttledIncr, 120);
_.delay(function(){ ok(counter == 3, "incr was throttled"); start(); }, 180);
});
asyncTest("functions: 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(){ ok(counter == 1, "incr was debounced"); start(); }, 220);
});
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(''); });