JSFiddle - React, Tailwind, and code Playground

by brbrown

JavaScript

function fibSum(n){
    var a = 0, b =1; total =0;
    if (n < 2){
        return 1;
    }
    while ((a && b) < n){
        c = a + b
        if (c%2==0){
            total +=c
        }
        a = b
        b = c
    }
return total}
console.log(fibSum(4000000))