array.prototype.splice

An ES spec-compliant Array.prototype.splice shim/polyfill/replacement that works as far down as ES3.

This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the spec.

Because Array.prototype.splice depends on a receiver (the “this” value), the main export takes the array to operate on as the first argument.

Engines where this is needed

Note: this list is not exhaustive.

• IE 8 and below, and pre-ES6 engines: deleteCount isn't defaulted to length - start until ES6
• Safari 5.0: sometimes it returns undefined
• Safari 7/8: sparse arrays of size 1e5 or greater break
• Opera 12.15: breaks on small sparse arrays

Example

var splice = require('array.prototype.splice');
var assert = require('assert');

var a = [1, 1, 1];
assert.deepEqual(splice(a, 1, 2), [1, 1]);
assert.deepEqual(a, [1]);

var splice = require('array.prototype.splice');
var assert = require('assert');
/* when Array#splice is not present */
delete Array.prototype.splice;
var shimmed = splice.shim();
assert.equal(shimmed, splice.getPolyfill());
assert.equal(shimmed, Array.prototype.splice);
assert.deepEqual([1, 2, 3].splice(1, 2, 3), splice([1, 2, 3], 1, 2, 3));

var splice = require('array.prototype.splice');
var assert = require('assert');
/* when Array#splice is present */
var shimmed = splice.shim();
assert.equal(shimmed, Array.prototype.splice);
assert.deepEqual([1, 2, 3].splice(1, 2, 3), splice([1, 2, 3], 1, 2, 3));

Tests

Simply clone the repo, npm install, and run npm test