Created
March 23, 2014 04:54
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| <!doctype html> | |
| <meta charset=utf-8> | |
| <title>setImmediate alternatives</title> | |
| <style> | |
| table td { | |
| padding: 20px; | |
| } | |
| .unavailable { | |
| text-decoration: line-through; | |
| } | |
| </style> | |
| <body> | |
| <h1>setImmediate alternatives</h1> | |
| <blockquote><table id="listing"></table></blockquote> | |
| <script> | |
| root = this; | |
| impls = {} | |
| setImpl = function(name, impl, call) { | |
| if (typeof root[name] !== 'undefined') { | |
| if (call) { | |
| impl = impl(); | |
| } | |
| impls[name] = impl; | |
| } else { | |
| impls[name] = false; | |
| } | |
| } | |
| // Old school | |
| setImpl('setTimeout', function(cb) { | |
| setTimeout(cb, 0); | |
| }); | |
| setImpl('MessageChannel', function() { | |
| var next = void 0; | |
| var chan = new MessageChannel(); | |
| chan.port1.onmessage = function() { | |
| var cb = next; | |
| next = void 0; | |
| cb(); | |
| }; | |
| return function(cb) { | |
| next = cb; | |
| chan.port2.postMessage(null); | |
| }; | |
| }, true); | |
| setImpl('MutationObserver', function() { | |
| var next = void 0; | |
| var div = document.createElement("div"); | |
| var observer = new MutationObserver(function() { | |
| var cb = next; | |
| next = void 0; | |
| cb(); | |
| }); | |
| observer.observe(div, {attributes: true}); | |
| return function(cb) { | |
| next = cb; | |
| div.setAttribute("class", "tick"); | |
| }; | |
| }, true); | |
| key = "sched-" + Math.random(); | |
| setImpl('postMessage', function() { | |
| var next = void 0; | |
| addEventListener("message", function(e) { | |
| if (e.source === root && e.data === key) { | |
| var cb = next; | |
| next = void 0; | |
| cb(); | |
| } | |
| }, false); | |
| return function(cb) { | |
| next = cb; | |
| postMessage(key, "*"); | |
| }; | |
| }, true); | |
| handleClick = function(name, $results) { | |
| return function() { | |
| $results.innerHTML = "Running ..." | |
| var i = 0; | |
| var schedule = impls[name]; | |
| var start = Date.now(); | |
| var cb = function() { | |
| if (i == 1000) { | |
| $results.innerHTML = Date.now() - start; | |
| } else { | |
| i += 1 | |
| schedule(cb); | |
| } | |
| } | |
| cb(); | |
| } | |
| } | |
| implNames = Object.keys(impls); | |
| implNames.sort(); | |
| $listing = document.getElementById('listing'); | |
| implNames.map(function(name) { | |
| var $tr = document.createElement('tr') | |
| var $runner = document.createElement('td') | |
| var $results = document.createElement('td') | |
| var impl = impls[name]; | |
| $runner.style.textAlign = 'right'; | |
| if (impl) { | |
| var $button = document.createElement('button') | |
| $button.innerHTML = name; | |
| $button.onclick = handleClick(name, $results); | |
| $runner.appendChild($button); | |
| } else { | |
| $runner.innerHTML = '<div class="unavailable">' + name + '</div>'; | |
| } | |
| $tr.appendChild($runner); | |
| $tr.appendChild($results); | |
| $listing.appendChild($tr); | |
| }); | |
| </script> |
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Results on OS X Mavericks: