# Sum of even Fibonacci terms in JavaScript

JavascriptWeb DevelopmentFront End TechnologyObject Oriented Programming

We are required to write a JavaScript function that takes in a number as a limit. The function should calculate and return the sum of all the Fibonacci numbers that are both smaller than the limit and are even.

For example −

If the limit is 100

Then the even Fibonacci terms are −

2, 8, 34

And the output should be −

44

## Example

Following is the code −

const sumOfEven = (limit) => {
let temp, sum = 0, a = 0, b = 1;
while (b < limit) {
if (b % 2 === 0) {
sum += b;
};
temp = a;
a = b;
b += temp;
};
return sum;
};
console.log(sumOfEven(100));
console.log(sumOfEven(10));
console.log(sumOfEven(1000));

## Output

Following is the output on console −

44
10
798
Published on 10-Dec-2020 12:10:22