NEED EXPLANATION FOR OUTPUT PLEASE

Question

c5 : function(){
let Lang = ['java', 'C', 'C++', 'C#', 'python'];
let x = Lang.pop();
let y = Lang.push('koltin');
console.log(x);
// output => python
console.log(y);
// output => 5
console.log(y+x);
// output => 5python
}

Answer 1

pop() Removes the last element of an array, and returns that element
push() Adds new elements to the end of an array, and returns the new length

source:(W3Schools)https://www.w3schools.com/jsref/jsref_obj_array.asp