Javascript Utils

utils.js

var createStringFixedLength = function (length, char){
  return new Array(length + 1).join(char);
};

createStringFixedLength(10, 'a'); //"aaaaaaaaaa"

// Generate a random string given a serie and a size, if serie is not proportionated hexadecimal base is used
var hashGenerator = function(size, serie){
    var serieBase = serie || '0123456789ABCDEF';
    var base = serieBase.length;
    var random = "";
    for (var i = 0; i < size; i++ ) {
        random += serieBase[Math.floor(Math.random() * base)];
    }
    return random;
}

hashGenerator(5); //"D490D"