i need to create a fibonacci function, i figured out the code for positive values
const fib = n => {
let prev = 0, next = 1;
for(let i = 0; i < n; i++){
next = prev + next;
prev = next - prev;
}
return prev;
}
maybe someone will tell you how to write code when n is a negative number
const fib = n => {
const isPositive = n >= 0
let prev = 0, next = 1;
for(let i = 0; i < Math.abs(n); i++){
next = prev + next;
prev = next - prev;
}
return isPositive ? prev : prev * -1;
}