Remove items from an array. Optionally limit the number of items to remove from the beginning or end of the array.

array.remove.js

/**
 * Author: Tony Brix
 * Website: tony.brix.ninja
 * License: MIT
 * Description: Remove items from an array. Optionally limit the number of items to remove from the beginning or end of the array.
 * Examples:
 *   var a = [1, 2, 3, 1, 2, 3];
 *   a.remove(1); // [2, 3, 2, 3]
 *   a.remove(2, 1); // [1, 3, 1, 2, 3]
 *   a.remove(3, -1); // [1, 2, 3, 1, 2]
 *   a.remove(function(el){ return el > 2; }); // [1, 2, 1, 2]
 *   a.remove(function(el, i){ return i % 2; }); // [1, 3, 2]
 */
Array.prototype.remove = function (predicate, limit, thisArg) {
	var func, numElements, length;

	//get function that returns true for elements to remove
	if (typeof predicate === "function") {
		func = predicate;
	} else {
		func = function (el) {
			return el === predicate;
		};
	}

	//get number of elements to remove
	if (typeof limit === "number") {
		numElements = limit;
	} else {
		numElements = false;
	}

	//get length of this
	length = this.length;

	//get new array
	var newArray = [];
	if (numElements < 0) {
		//start from last element
		var numRemoved = 0;
		for (var i = length - 1; i >= 0; i--) {
			if ((numElements !== false && numRemoved === -numElements) || !func.call(thisArg, this[i], i, this)) {
				newArray.unshift(this[i]);
			} else {
				numRemoved++;
			}
		}
	} else {
		//start from first element
		var numRemoved = 0;
		for (var i = 0; i < length; i++) {
			if ((numElements !== false && numRemoved === numElements) || !func.call(thisArg, this[i], i, this)) {
				newArray.push(this[i]);
			} else {
				numRemoved++;
			}
		}
	}
	return newArray;
};