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All Projects → sindresorhus → Negative Array

sindresorhus / Negative Array

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

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negative-array

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(['🐴', '🎂', '🌈']);

// 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 © Sindre Sorhus

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