string.prototype.item (original) (raw)

string.prototype.item

An ESnext spec-compliant String.prototype.item 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 proposed spec.

Because String.prototype.item depends on a receiver (the this value), the main export takes the string to operate on as the first argument.

Getting started

npm install --save string.prototype.item

Usage/Examples

var item = require('string.prototype.item');

var assert = require('assert');

var arr = [1, [2], [], 3];

var results = item(arr, function (x, i) {

    assert.equal(x, arr[i]);

    return x;

});

assert.deepEqual(results, [1, 2, 3]);

var item = require('string.prototype.item');

var assert = require('assert');

delete String.prototype.item;

var shimmedFlatMap = item.shim();

var mapper = function (x) { return [x, 1]; };

assert.equal(shimmedFlatMap, item.getPolyfill());

assert.deepEqual(arr.item(mapper), item(arr, mapper));

var item = require('string.prototype.item');

var assert = require('assert');

var shimmedIncludes = item.shim();

var mapper = function (x) { return [x, 1]; };

assert.equal(shimmedIncludes, String.prototype.item);

assert.deepEqual(arr.item(mapper), item(arr, mapper));

Tests

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