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I wish to comment more on my observations with nodejs

var sum = 0
for (var i = 0; i < 100000000; i++) {
    sum +=i //this is slower. Use sum = sum + 1
    //sum += 1 gave me 1.963235s on my machine whereas
    //sum = sum + 1 gave me 0.506995s
}
console.log(sum);        

//I also rewrote it using while loop and the performance increase

var sum = 0;
limit = 100000000;
while(limit > 0)
{
    sum = sum + limit--;
}
console.log(sum)

//I noticed the summation was completed in 0.214555s 

//The ram of my system is 6GB, core i3.