/**
 * Author: Andrew Hedges, [email protected]
 * License: free to use, alter, and redistribute without attribution
 */

/**
 * Delete the value passed in and any values after it from the array
 */
Array.prototype.sliceTo = function (val) {
	var len;
	len = this.length;
	while (len > -1) {
		if (val === this[len]) {
			this.length = len;
			break;
		}
		--len;
	}
};
// END: Array.prototype.sliceTo

// trust, but verify!
var a = ['zero', 'one', 'two', 'three', 'four', 'five', 'six'];
var b = ['zero', 'one', 'two', 'three', 'four', 'five', 'six'];
var c = ['zero', 'one', 'two', 'three', 'four', 'five', 'six'];
var d = [];

console.log('begin: a');
console.log(a);
a.sliceTo('three');
console.log(a);
console.log('end: a');

console.log('begin: b');
console.log(b);
b.sliceTo('zero');
console.log(b);
console.log('end: b');

console.log('begin: c');
console.log(c);
c.sliceTo('eleventeen');
console.log(c);
console.log('end: c');

console.log('begin: d');
console.log(d);
d.sliceTo('three');
console.log(d);
console.log('end: d');

/**
 * Delete the value passed in and any values after it from the array
 */
Array.prototype.sliceTo = function (val) {
	var len;
	len = this.length;
	while (len > -1) {
		if (val === this[len]) {
			this.length = len;
			break;
		}
		--len;
	}
};
// END: Array.prototype.sliceTo

// trust, but verify!
var a = ['zero', 'one', 'two', 'three', 'four', 'five', 'six'];
var b = ['zero', 'one', 'two', 'three', 'four', 'five', 'six'];
var c = ['zero', 'one', 'two', 'three', 'four', 'five', 'six'];
var d = [];

console.log('begin: a');
console.log(a);
a.sliceTo('three');
console.log(a);
console.log('end: a');

console.log('begin: b');
console.log(b);
b.sliceTo('zero');
console.log(b);
console.log('end: b');

console.log('begin: c');
console.log(c);
c.sliceTo('eleventeen');
console.log(c);
console.log('end: c');

console.log('begin: d');
console.log(d);
d.sliceTo('three');
console.log(d);
console.log('end: d');

Adds a method to the Array object that lets you slice the array down to everything before the given value.

Array.prototype.sliceTo

array

JavaScript