what does arr.push() do in js code example

Example 1: push array javascript

let array = ["A", "B"];
let variable = "what you want to add";

//Add the variable to the end of the array
array.push(variable);

//===========================
console.log(array);
//output =>
//["A", "B", "what you want to add"]

Example 2: js push array

array.push(element_to_push);