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babel-plugin-array-includes

2.0.1
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  • License MIT

Replaces `arr.includes(val)' with `arr.indexOf(val) >= 0`.

Package Exports

  • babel-plugin-array-includes

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (babel-plugin-array-includes) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

babel-plugin-array-includes

Replaces arr.includes(val) with arr.indexOf(val) >= 0.

Thanks to @sebmck for the help.

Example

In

[1, 2, 3, 5, 8, 13].includes(4);

Out

"use strict";

[1, 2, 3, 5, 8, 13].indexOf(4) >= 0;

Pitfalls

This doesn't work:

In

function foo(arr) {
  return arr.includes('foo');
}

Out

function foo(arr) {
  return arr.includes('foo'); // still includes
}

You have to specify that arr is an array.

In

function foo(arr:Array) {
  return arr.includes('foo');
}

Out

function foo(arr) {
  return arr.indexOf('foo') >= 0; // now it works
}

Installation

$ npm install babel-plugin-array-includes

Usage

.babelrc

{
  "plugins": ["array-includes"]
}

Via CLI

$ babel --plugins array-includes script.js

Via Node API

require("babel-core").transform("code", {
  plugins: ["array-includes"]
});