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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.

    Proxies are objects for which the programmer has to define the semantics in JavaScript. The default object semantics are implemented in the JavaScript engine, often written in lower-level languages like C++. Proxies let the programmer define most of the behavior of an object in JavaScript. They are said to provide a meta-programming API.

    Usage

    $ npm install negative-array
    
    const negativeArray = require('negative-array');
     
    // Adds negative array index support to any given array
    const unicorn = negativeArray(['pony', 'cake', 'rainbow']);
     
    // Get the last item by using a negative index
    console.log(unicorn[-1]);
    //=> 'rainbow'
     
    // OMG, YES!

    License

    MIT © Sindre Sorhus

    install

    npm i negative-array

    Downloadsweekly downloads

    3

    version

    2.0.1

    license

    MIT

    repository

    githubgithub

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