Function that counts down a number in an array

JavaScript
1

Hi everyone,

I’ve been working on this code and been having some trouble with it. I think it has something to do with the for loop.
This function should take a number, and create an array of numbers counting down from this number to 0.

function countdown(start) {
	for (let i = 0; i <= start; i++) {
		start.push[i];
		}
	return start.reverse();
}

I keep getting this error…

TypeError: Cannot read property '0' of undefined
    at countdown

I cannot seem to find out what the problem is… Is there anyone that can possibly help me with this?

Thanks,
Peter

2

Hello there,

push is an array method. This means is it called like a function: myArray.push()

The current code is trying to index into it .push[0] which cannot happen, unless you have defined start like this:

const start = { push: [1, 2, 3, 4] }; // Just an example

Hope this clarifies

2 Likes
3

Got it!

function countdown(start) {
	var myArray = [];
	for (let i = 0; i <= start; i++) {
		myArray.push(i);
		}
	return myArray.reverse();
}

This seemed to solve it. Thanks alot!

-Peter