Multithreaded js Array.map by dynamically generating workers

retarded.array.map.js

//toSource polyfill
//https://raw.githubusercontent.com/oliver-moran/toSource.js/master/toSource.min.js
if("undefined"==typeof Object.toSource){var 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escape2=function(a){a=a.replace(/"/g,'\\"');a=a.replace(/\n/g,"\\n");return a=a.replace(/\r/g,"\\r")};Number.prototype.toSource=function(){return"(new Number("+this.toString()+"))"};Boolean.prototype.toSource=function(){return"(new Boolean("+this.toString()+"))"};String.prototype.toSource=function(){return'(new String("'+escape2(this)+'"))'};Function.prototype.toSource=function(){return this.toString()};Array.prototype.toSource=function(){return _arrayToSource(this,[])};var _arrayToSource=function(a, e){e.push(a);var b="[";a.forEach(function(a,f,g){switch(typeof a){case "number":case "boolean":b+=a.toString();break;case "string":a=escape2(a);b+='"'+a+'"';break;case "function":case "object":b=a instanceof Function||a instanceof Date||a instanceof RegExp||a instanceof Error?b+a.toSource():a instanceof Array?b+(-1==e.indexOf(a)?_arrayToSource(a,e):"[]"):a instanceof Object?b+(-1==e.indexOf(a)?_objectToSource(a,e):"{}"):b+"null";break;default:b+="null"}f<g.length-1&&(b+=", ")});return b+="]"};Object.prototype.toSource= function(){return"("+_objectToSource(this,[])+")"};var _objectToSource=function(a,e){e.push(a);var b="{";Object.getOwnPropertyNames(a).forEach(function(c,f,g){var d=c;js_id.test(d)||(d="'"+d.replace(/'/g,"'")+"'");switch(typeof a[c]){case "number":case "boolean":b+=d+":"+a[c].toString();break;case "string":c=escape2(a[c]);b+=d+':"'+c+'"';break;case "function":case "object":b=a[c]instanceof Function||a[c]instanceof Date||a[c]instanceof RegExp||a[c]instanceof Error?b+(d+":"+a[c].toSource()):a[c]instanceof Array?b+(-1==e.indexOf(a[c])?d+":"+_arrayToSource(a[c],e):d+":[]"):a[c]instanceof Object?b+(-1==e.indexOf(a[c])?d+":"+_objectToSource(a[c],e):d+":{}"):b+(d+": null");break;default:b+=d+": null"}f<g.length-1&&(b+=", ")});return b+="}"};Date.prototype.toSource=function(){return"(new Date("+this.valueOf()+"))"};RegExp.prototype.toSource=function(){return this.toString()};Error.prototype.toSource=function(){var a="(new "+this.name+'("'+escape2(this.message)+'"';"string"==typeof this.fileName&&(a+=', "'+ escape2(this.fileName)+'"',"number"==typeof err.lineNumber&&(a+=", "+err.lineNumber));return a+"))"};if(Object.defineProperty){var objects=[Number,Boolean,String,Function,Array,Object,Date,RegExp,Error];objects.forEach(function(a){Object.defineProperty(a.prototype,"toSource",{writable:!0,enumerable:!1,value:a.prototype.toSource})})}};


function Deferred() {
    this.resolve = null;
    this.reject = null;
    this.promise = new Promise(function (resolve, reject) {
        this.resolve = resolve;
        this.reject = reject;
    }.bind(this));
    Object.freeze(this);
}

function spawnWorker(func) {
    var onmsg = function (e) {
        postMessage(e.data.map(func));
        close();
    };
    var workString = `(function() {func=${func.toSource()},onmessage=${onmsg.toSource()}})()`;
    var _blob = new Blob([workString], {type: 'application/javascript'});
    var worker = new Worker(window.URL.createObjectURL(_blob));
    return worker;
}

//Approach 1: Split array into equal parts
Array.prototype.mmap = async function (predicate, threads) {
    if (!Array.isArray(this)) throw '"this" is null or not defined';
    if (typeof predicate !== 'function') throw 'predicate must be a function';
    if (this.length === 0) return [];

    let promises = new Array(threads).fill(null);
    let workers = new Array(threads);
    for (let i = threads - 1; i >= 0; i--) {
        workers[i] = spawnWorker(predicate);
        let part = this.slice(i * Math.ceil(this.length / threads), (i + 1) * Math.ceil(this.length / threads));
        promises[i] = new Promise((resolve) => {workers[i].onmessage = resolve});
        workers[i].postMessage(part);
    }
    let result = (await Promise.all(promises)).map(e => e.data).flat();
    workers.forEach(worker => worker.terminate());
    return result;
};

function spawnWorker2(func) {
    var onmsg = function (e) {
        postMessage([e.data[0], func(e.data[1])]);
    };
    var workString = `(function() {func=${func.toSource()},onmessage=${onmsg.toSource()}})()`;
    var _blob = new Blob([workString], {type: 'application/javascript'});
    var worker = new Worker(window.URL.createObjectURL(_blob));
    return worker;
}

//Approach 2: Pass each value
Array.prototype.mmap2 = function (predicate, threads) {
    if (!Array.isArray(this)) throw '"this" is null or not defined';
    if (typeof predicate !== 'function') throw 'predicate must be a function';
    if (this.length === 0) return [];

    let result = new Array(this.length);
    let workers = new Array(threads).fill(null).map(() => spawnWorker2(predicate));
    var defer = new Deferred();
    workers.forEach(
        worker => worker.onmessage =
            (e) => {
                result[e.data[0]] = e.data[1];
                if (e.data[0] === this.length - 1) defer.resolve(result)
            }
    );
    for (let i = 0; i < this.length; i++) {
        workers[i % threads].postMessage([i, this[i]]);
    }
    return defer.promise;
};
var startTime, result;
var testArray = Array(10000000).fill().map((v, i) => i);
var testFunc = function (cv, ci, a) {
    return Math.sin(cv) * Math.tan(cv);
};

(async () => {
    startTime = Date.now();
    result = testArray.map(testFunc);
    console.log("single:", Date.now() - startTime, result);

    startTime = Date.now();
    result = testArray.mmap(testFunc, navigator.hardwareConcurrency);
    console.log("multithreaded setup", Date.now() - startTime);
    result = await result;
    console.log("multithreaded:", Date.now() - startTime, result);
    
    startTime = Date.now();
    result = testArray.mmap(testFunc, navigator.hardwareConcurrency-1);
    console.log("multithreaded w/unused thread setup", Date.now() - startTime);
    result = await result;
    console.log("multithreaded w/unused thread:", Date.now() - startTime, result);


//    startTime = Date.now();
//    result = testArray.mmap2(testFunc, navigator.hardwareConcurrency);
//    console.log("multithread(2) setup", Date.now() - startTime);
//    result = await result;
//    console.log("multithreaded approach 2:", Date.now() - startTime, result);
})();