JavaScript Essentials: Arrays

Essentials is a series that covers the most used and important methods for X topic. It’s a series for developers who know another language or someone who wants a quick start. In this post we cover Arrays.

Prerequisites

It’s suggested that you know about Arrow Functions and Ternary expressions before reading.

Array Basics

You should know what Arrays are, but just in case here’s a quick overview. Arrays are like boxes that contain stuff inside them, you can remove items, add items or manipulate them. They’re like lists in Python or Arrays in most languages.

Array Creation

Here are a few ways to create Arrays.

Adding / Removing Basics

Common Methods

An overview of common scenarios and the method to use for each scenario. You’ll notice most methods that take a callback function have the same parameters: ( element, index, array )

Below are code blocks with a scenario/task described in a comment up top then some code below.

Modify Every Element in the Array

Copy Without Mutating

Find the Element(s)/Index

Is this Element in the Array?

No Duplicates

Does Every Item in the Array fulfill these Requirements?

Do Some of the Items in the Array fulfill these Requirements?

Populate an Array of Emptiness

Wtf Sort?

How to Reverse a String?

Flatten an Array

Convert this Array into an Object

Loopy Loops

References

Thanks for reading! Leave any feedback in the comments and let me know if there’s a better way to structure these posts ( updated to use Carbon instead of Medium code blocks )

 

SOURCE: https://codeburst.io/javascript-essentials-arrays-2d275b9598c5

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