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An ESnext spec-compliant String.prototype.at 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.at depends on a receiver (the this value), the main export takes the string to operate on as the first argument.

Note that versions of this package before v1.0.0 reflect an earlier, now-inactive proposal (https://github.com/mathiasbynens/String.prototype.at).

Getting started

``sh
npm install --save string.prototype.at
`

Usage/Examples

`js
var at = require('string.prototype.at');
var assert = require('assert');

var arr = [1, [2], [], 3];

var results = at(arr, function (x, i) {
assert.equal(x, arr[i]);
return x;
});

assert.deepEqual(results, [1, 2, 3]);
`

`js
var at = require('string.prototype.at');
var assert = require('assert');
/ when String#at is not present /
delete String.prototype.at;
var shimmedFlatMap = at.shim();

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

assert.equal(shimmedFlatMap, at.getPolyfill());
assert.deepEqual(arr.at(mapper), at(arr, mapper));
`

`js
var at = require('string.prototype.at');
var assert = require('assert');
/ when String#at is present /
var shimmedIncludes = at.shim();

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

assert.equal(shimmedIncludes, String.prototype.at);
assert.deepEqual(arr.at(mapper), at(arr, mapper));
`

Tests


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

[package-url]: https://npmjs.org/package/string.prototype.at
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