//get a column of an array
Array.prototype.getColumn = function(name) {
	return this.map(function(el) {
		// gets corresponding 'column'
		if (el.hasOwnProperty(name)) return el[name];
		// removes undefined values
	}).filter(function(el) { return typeof el != 'undefined'; }); 
};
//dataArray = [10000000,12000000,12000000,13000000];
//remove duplicates in an array
Array.prototype.contains = function(v) {
	for(var i = 0; i < this.length; i++) {
		if(this[i] === v) return true;
	}
	return false;
};
Array.prototype.unique = function() {
	var arr = [];
	for(var i = 0; i < this.length; i++) {
		if(!arr.contains(this[i])) {
			arr.push(this[i]);
		}
	}
	return arr; 
};

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