Even_Fibonacci_numbers.js

// https://projecteuler.net/problem=2
var getSumOfEvenFibonacciNum = function (limit){
  var evenNum=2,prevEvenNum=0,sumOfEvenFibonacciNum=evenNum;
   while (evenNum<=limit){
      var tempEvenNum=evenNum;
      evenNum=(evenNum*4)+prevEvenNum;
      if(evenNum>limit) break;
      prevEvenNum=tempEvenNum;
      sumOfEvenFibonacciNum+=evenNum;
   }
 return sumOfEvenFibonacciNum;
}
console.log(getSumOfEvenFibonacciNum(4000000));