GPE_SuperArray - meant to sort and do cool things with array

console.log("Initiating GPE Super Array extension.");
Array.prototype.at = function(atPos)
{
    if( atPos < this.length )
    {
        return this[atPos];
    }
    return -1;
}

Array.prototype.makeLowercase = function()
{
    for (var i = 0; i < this.length; i++)
    {
        if (typeof this[i] === 'string')
        {
             this[i] = this[i].toLowerCase();
         }
     }
}


Array.prototype.makeUppercase = function()
{
    for (var i = 0; i < this.length; i++)
    {
        if (typeof this[i] === 'string')
        {
             this[i] = this[i].toUpperCase();
         }
     }
}

Array.prototype.floorValues = function()
{
    for (var i = 0; i < this.length; i++)
    {
        if (typeof this[i] === 'number')
        {
             this[i] = Math.floor(this[i]);
         }
     }
}

Array.prototype.roundValues = function()
{
    for (var i = 0; i < this.length; i++)
    {
        if (typeof this[i] === 'number')
        {
             this[i] = Math.round(this[i]);
         }
     }
}

Array.prototype.roundByDecimals = function(decimalPlaces)
{
    var roundByTens = 0;
    decimalPlaces = Math.floor(decimalPlaces);
    if (decimalPlaces >=0 )
    {
        roundByTens = Math.pow(10,decimalPlaces);
        for (var i = 0; i < this.length; i++)
        {
            if (typeof this[i] === 'number')
            {
                 this[i] = Math.round(this[i]/roundByTens)* roundByTens;
             }
         }
    }
    else
    {
         //handle negative decimal places(.1, .01, .001, etc, etc)
        for (var i = 0; i < this.length; i++)
        {
            roundByTens = Math.pow(10,-1*decimalPlaces);
            if (typeof this[i] === 'number')
            {
                this[i] = roundedBeforeDecimal+ (Math.round(this[i]*roundByTens)/roundByTens);
             }
         }
    }
}

Array.prototype.ceilValues = function()
{
    for (var i = 0; i < this.length; i++)
    {
        if (typeof this[i] === 'number')
        {
             // this is a string
             this[i] = Math.ceil(this[i]);
         }
     }
}

Array.prototype.size = function()
{
     return this.length;
}

//emulates the push_back push_front
Array.prototype.push_back = function(inValue)
{
     this.push(inValue);
}


Array.prototype.pop_back = function()
{
     return this.pop();
}

console.log("GPE Super Array loaded");