What is adder in this code snippet? I can't find an answer

Question

I'm trying to figure out what is a const variable if we assign it to a array.push method

const numbers = [0,33,4,1]
const adder = numbers.push(2)

What does adder become here ? If i write it in the console it gives me the length of the numbers array. Is it bad practice to assign an array method to a variable ?

Answer 1

What does adder become here ?

It's assigned the return value of push . So look at the documentation for push :

The push() method adds one or more elements to the end of an array and returns the new length of the array.

So it is the length of the array.

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Is it bad practice to assign an array method to a variable ?

In general (there are exceptions) it isn't useful to assign an array method to a variable … but that isn't what this code is doing. The return value of a method is not the method itself.