Sum of even Fibonacci Numbers less than 4 million

https://projecteuler.net/problem=2

by Hari Menon

JavaScript

function sumOfEvenFibsLessThan4M() {
	var a = 0, b = 1, f = 0, sum = 0;
    while(f < 4000000) {
        f = b + a;
        a = b;
        b = f;
        if (f % 2 === 0) {
            sum += f;
        }
    }
    return sum;
}

console.log(sumOfEvenFibsLessThan4M());