ExtraNumber.js

/** 

This module exports only a single additional method for built-in <code>Number</code> object. 

 */

// trick doc.js into thinking that we have declared the class. 
/*
function Number() {
}
*/


/**

Will return human-readable price for given integer. 

@return {String} human-readable price. 

Example: 

	var price = 233700;
	price.humanReadablePrice(); // "23.37"

 */
Number.prototype.humanReadablePrice = function() {
	return (this/10000).toFixed(2);
};

/**

Will return zero-padded number.

@param {Integer} length pad length.

@return {String} human-readable zero-padded number.

Example: 

	var something = 9;
	something.pad(2); // "09";

 */
Number.prototype.pad = function(length) {
	var _num = this.toString();
	if (_num.length > length) { 
		return _num;
	}
	
  return (new Array(length).join('0') + this).slice(-length);
};

/**

Will return number shorted to an order of magnitude with one-letter description.

@return {String} human-readable number

Example: 

	var something = 93000000;
	something.humanReadableOrder(); // "9.3m";

 */
Number.prototype.humanReadableOrder = function() {
	if (this>=1000000000) {
		return (this/1000000000).toFixed(1)+'b';
	}

	if (this>=1000000) {
		return (this/1000000).toFixed(1)+'m';
	}

	if (this>=1000) {
		return (this/1000).toFixed(1)+'k';
	}
	
	return this.toString();
};