I collected the most used ES5 array methods as a polyfill for older browsers (IE …).
https://github.com/zhongdeliu/array-polyfill
Based on the great reference at MDN Arrays, it has fallbacks for
Array.every, Array.some, Array.filter, Array.forEach, Array.indexOf, Array.reduce.
To install / use it you either can clone the github repository or fetch it via Bower. Then include it per script tag, before your scripts.