"Debug this code: for(i=0; i<=arr.length; i++) { console.log(arr[i]); }"

Two issues: First, you're missing 'let' or 'var' before 'i', which creates a global variable (bad practice). Second, your condition is i<=arr.length but arrays are zero-indexed, so you'll access arr[arr.length] which is undefined. Change to: for(let i = 0; i < arr.length; i++)

Classic off-by-one! Your loop runs one time too many. If arr has 3 items (indexes 0,1,2), arr.length is 3, so you're trying to access arr[3] which doesn't exist. Use < instead of <=. Also declare i with let.

Change <= to < in your loop condition. Arrays start at 0 so the last index is length-1. Also add 'let' before i.