Write a function that returns a string of length Num consisting of alternating characters: “a” and “b”, starting with an “a” character.
For example, giver Num=5, your function should return “ababa”.
function altChars(Num) { let result = ''; for (i = 0; i < Num; i++) { if (i % 2 == 0) { result += 'a'; } else { result += 'b'; } } return result; }