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Map, reduce, and filter are three very useful array methods in JavaScript that give developers a ton of power in a short amount of space. Let’s jump right into how you can leverage (and remember how to use!) these super …

I love shopping online. I can find what I need and get most things for a decent price. I am Nigerian currently working and studying in India, and two things I dread when shopping online are:

1. Filling out a credit

Let’s say you have a map of the world and you want to be able to highlight the country (or state, or county, etc.) as the cursor hovers over it or it is tapped.

Doable!

First, the map should probably …