logic of introducing varuable in fibnacci, javascript

Question

please could somebody explain me how a computer gets to know in this code that the variable "i" somehow refers to the array fib?I don't really understand the logic of this

function fibb(n) {
  var fib = [];
  if (n === 1) {
    fib = [0];
  } else
  if (n === 2) {
    fib = [0, 1];
  } else {
    fib = [0, 1];
    for (var i = 2; i < n; i++) {
      fib.push(fib[fib.length - 2] + fib[fib.length - 1]);
    }
  }

question from:https://stackoverflow.com/questions/65883897/logic-of-introducing-varuable-in-fibnacci-javascript

Answer 1

I am assuming you are new to programming. In the code i never refers to the array fib. What is happening is that the for loop is iterating the inner instructions n-2 times, and the inner instruction is written in such a way that in never needs to be pointed by i. The loop inside always adds the last 2 numbers of the fib array and appends in fib array.