Javascript Array Iterative Methods (Part 2.1): Our own filter function!

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One of the best ways to learn and understand how to use the array method "filter", is to understand exactly what's going on behind the scenes, and what better way that to create your own filter function! Libraries such as Underscore and Lodash provide their own versions of "filter", they're said to be faster than the native ones.

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OS: Elementary OS (Ubuntu-based Linux distribution)
Capture software: Kazam
Web-browser: Vivaldi (chromium-based)
OS Icon Theme: Numix Circle

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