Attempt at a Global String.pad method set:

String.pad.js

/**
 * Pads the left side of a string to `length` with N `char` characters 
 * @note If the string.length is greater than length, the method will not truncate to length
 * @param  {int}   length   The length of the desired string result
 * @param  {str}   char     Character to pad the string with
 * @return {string}         The padded string
 */
String.prototype.padLeft = function(length, char) { 

    char    = char || ' ';
    length  += 1;   // TODO: figure out why we get an off by one error when returning str + pad

    // remove leading/trailing spaces
    var str = this.toString().trim();
    
    console.log(length, ' | ', str.length);
    
    var pad = length - str.length < 0 ? '' : new Array(length - str.length).join(char);

    console.log(length - str.length, ' | ', str.length);

    return pad + str;
}


/**
 * Pads the right side of a string to `length` with N `char` characters 
 * @note If the string.length is greater than length, the method will not truncate to length
 * @param  {int}   length   The length of the desired string result
 * @param  {str}   char     Character to pad the string with
 * @return {string}         The padded string
 */
String.prototype.padRight = function(length, char) { 

    char    = char || ' ';
    length  += 1;   // TODO: figure out why we get an off by one error when returning str + pad

    // remove leading/trailing spaces
    var str = this.toString().trim();
    

    console.log(length, ' | ', str.length);
    
    var pad = length - str.length < 0 ? '' : new Array(length - str.length).join(char);

    console.log(length - str.length, ' | ', str.length);

    return str + pad;
}