Fibonacci Number (Last Digit)

This JavaScript code is written to demonstrate how to calculate the last digit of fibonacci numbers. For more information on fibonacci numbers, checkout this post.

function findFibonacciLastDigit(num){
    if(num <= 1){
        return num;
    }   
    let previous = 0;
    let current = 1;
    for(let i = 0; i < num-1; i++){
        let nextFib = (previous + current) % 10;
        previous = current;
        current = nextFib;
    }   
    return current; 
}