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One thing that sucks about javascript workers is that the data you give them is copied rather than shared. Browsers use the structured clone algorithm defined in the HTML5 specs to accomplish that.

As you probably know, that algorithm isn't capable of cloning Function objects, so it's pretty useless in some cases. But there's a simple workaround if you need to pass a function to a worker thread:

// the worker code: function parseFunction(fnstr) {    try{       var fn = Function(fnstr)    }catch(err) {       console.log("failed to build function from %s", fnstr)    }    return fn } self.onmessage = function(e) {    var fn = parseFunction(e.data)    fn() }

// the main thread: function serializeFunction(fn) {    var fnstr = fn.toString().replace(/^function[^\)]*\)[^\{]*\{|\}$/g, "")    return fnstr } function testFn() {    console.log("called testFn in another thread!") } worker.postMessage(serializeFunction(testFn))