Скачать или смотреть Reduce basics - Part 3 of Functional Programming in JavaScript

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In this video series, we learn how to do functional programming in JavaScript. In this third one, I show you how reduce fits into your toolbox and a basic example of it's usage.
Code from the video here:
https://jsfiddle.net/mattiasjle/w789n...

How to install and use io.js (for the arrow functions example)
http://davidwalsh.name/es6-io

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