TheGreatRambler

// Function that can run a function supplied in a web worker
// MIT License Copyright TheGreatRambler
// Free to use
function runInWebWorker(func, argsarray, callback) {
    // func: function to use
    // argsarray: the arguments to pass
    // callback: the callback function
    var blobdata = 'var returnstatement=(' + func.toString() + ')(' + argsarray.join(",") + ');self.postMessage(returnstatement);self.close();';
    console.log(blobdata);
    var blobURL = URL.createObjectURL(new Blob([blobdata], {

TheGreatRambler

function returnheaders(ajaxrequest) {
    var headers = ajaxrequest.getAllResponseHeaders(); 
    var arrofheaders = headers.trim().split(/[\r\n]+/);
    var mapofheaders = {};
    arrofheaders.forEach(function (line) {
      var parts = line.split(': ');
      var header = parts.shift();
      var value = parts.join(': ');
      mapofheaders[header] = value;
    });

TheGreatRambler

function randomlySplitArray(inputarray, chunksize, numofloops) {
    function randomint(min, max) {
        return Math.floor(Math.random() * (max - min + 1)) + min;
    }
    var temparray = inputarray;
    for (var q = 0; q < numofloops; q++) {
        var start = randomint(0, inputarray.length - chunksize);
        var othertemp = temparray.splice(start, chunksize);
        var index = randomint(0, temparray.length - chunksize - 1);
        // https://stackoverflow.com/questions/7032550/javascript-insert-an-array-inside-another-array

TheGreatRambler

// src https://codepen.io/sachmata/post/elegant-pairing

szudzik.getindex = function(x, y) {
    var xx = x >= 0 ? x * 2 : x * -2 - 1;
    var yy = y >= 0 ? y * 2 : y * -2 - 1;
    return (xx >= yy) ? (xx * xx + xx + yy) : (yy * yy + xx);
};

szudzik.unpair = function(z) {
    var sqrtz = Math.floor(Math.sqrt(z));

TheGreatRambler

function distancebetweentwopoints(x1, y1, x2, y2) {
      if (x1 > x2) {
          x1 = x1 - x2;
          x2 = 0;
      } else {
          x2 = x2 - x1;
          x1 = 0;
      }
      if (y1 > y2) {
          y1 = y1 - y2;