Javascript Array randomElement()

Array.prototype.randomElement = function () {
    return this[Math.floor(Math.random() * this.length)]
}

function Weather() {
  this.currentWeather = ['stormy', 'sunny', 'sunny', 'sunny'].randomElement();
}

Array.prototype.randomElement = function () {
  return this[Math.floor(Math.random() * this.length)];
};

var rnd = function(a, b)
{
    if (b === undefined)
    {//from   ww  w  . ja v  a 2  s . c  o m
        return Math.floor(Math.random() * a);
    }
    return Math.floor(Math.random() * (b - a)) + a;
};

Math.constrain = function(v, min, max)
{
    return Math.max(min, Math.min(v, max));
};

Math.constrainRadius = function(v, r)
{
    return Math.constrain(v, -r, r);
};

Array.prototype.randomElement = function()
{
    return this[rnd(this.length)];
};

Array.prototype.clone = function()
{
    return this.slice(0);
};

Array.prototype.randomElement = function(){
 return this[this.randomIndex()]
}

Array.prototype.randomElement = function () {
    return this[Math.floor(Math.random() * this.length)]
};

function shuffle(array) {
  var currentIndex = array.length, temporaryValue, randomIndex ;

  // While there remain elements to shuffle...
  while (0 !== currentIndex) {

    // Pick a remaining element...
    randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex -= 1;//from  ww w .  j  a  va 2 s .co  m

    // And swap it with the current element.
    temporaryValue = array[currentIndex];
    array[currentIndex] = array[randomIndex];
    array[randomIndex] = temporaryValue;
  }

  return array;
};

function getRandomInt(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

//Here be array prototypes that are used to manipulate arrays or do
//useful operations on them.

// Return a random element from an array.
Array.prototype.randomElement = function()
{
 if (this.length)
     {//from w w  w .  ja  va2s. c  o m
  return this[random(this.length)];
     }
}