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.

$ npm install negative-array

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!

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

MIT © Sindre Sorhus