Array.push return pushed value?

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See my detailed answer here

TLDR;
You can get the return value of the mutated array, when you instead add an element using array.concat[].

concat is a way of “adding” or “joining” two arrays together. The awesome thing about this method, is that it has a return value of the resultant array, so it can be chained.

newArray = oldArray.concat[newItem];

This also allows you to chain functions together

updatedArray = oldArray.filter((item) => {
item.id !== updatedItem.id).concat[updatedItem]};

Where item = {id: someID, value: someUpdatedValue}

The main thing to notice is, that you need to pass an array to concat.
So make sure that you put your value to be “pushed” inside a couple of square brackets, and you’re good to go.
This will give you the functionality you expected from push()

You can use the + operator to “add” two arrays together, or by passing the arrays to join as parameters to concat(). 

let arrayAB = arrayA + arrayB;
let arrayCD = concat(arrayC, arrayD);

Note that by using the concat method, you can take advantage of “chaining” commands before and after concat.

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