Too Long; Didn't Read
Below is a list of pretty much any action you would want to perform on an array, and how to do it in Javascript. If you have any more ideas, let me know in the comments below. You can also read about inserting at an index in detail in detail [here] Here is an example of how to insert an item into an array at a specific index in Javascript using the 'splice()' and 'indexOf' function. The ES6 version for modern browsers and Node.JS is available in ES6 and NodeJS.