negative-array

by sindresorhus

sindresorhus /negative-array

Negative array index support `array[-1]` using ES2015 Proxy

414 Stars 27 Forks Last release: over 1 year ago (v2.1.0) MIT License 34 Commits 8 Releases

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Negative array index support

array[-1]
using ES2015
Proxy

JavaScript doesn't natively support the use of a negative index to get items backwards from the end, but with ES2015 Proxy it's possible. Take a look at the source to see how simple it is to implement and read this short article about it.

Install

$ npm install negative-array

Usage

const negativeArray = require('negative-array');

// Adds negative array index support to any given array const unicorn = negativeArray(['🐴', 'πŸŽ‚', '🌈']);

// Get the last item by using a negative index console.log(unicorn[-1]); //=> '🌈'

// OMG, YES!

Related

  • on-change - Watch an object or array for changes (Uses
    Proxy
    too)
  • known - Allow only access to known object properties (Uses
    Proxy
    too)

License

MIT Β© Sindre Sorhus

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