JavaScript - Adding 2 integers simply doesn't do anything

Question

When I try to add two integers together, the integer just stays at what it originally was. It's difficult to explain, so here's my code:

var levelRewardsID = parseInt(resultData[0].levelRewardsHighestID)
var levelRewardsIDIncrease = Math.floor(Math.random()*9)+1
var newLevelRewardsID = levelRewardsID+levelRewardsIDIncrease
console.log(levelRewardsID)
console.log(levelRewardsIDIncrease)
console.log(newLevelRewardsID)
if (!isNaN(levelRewardsID)) {
  console.log("not NAN")
}
if (!isNaN(levelRewardsIDIncrease)) {
  console.log("not NAN 2")
}
if (!isNaN(newLevelRewardsID)) {
   console.log("not NAN 3")
}

Console:

89819672607051330000
6
89819672607051330000
not NAN
not NAN 2
not NAN 3

So as you can see, everything is an integer. So that can't be the issue. Yet when I try to do var newLevelRewardsID = levelRewardsID+levelRewardsIDIncrease, the output is the same as levelRewardsID... I'm not sure what I did wrong but if anyone knows, do let me know. Thanks!

Note: I'm using Node.JS version 9.1.0 (latest as of posting this) if that helps

Can you reproduce issue at stacksnippets at Question? See https://stackoverflow.com/help/mcve — guest271314, Nov 10 '17 at 18:23
@aaron just makes the logs have a color, its a library im using called `colors` for node.JS/NPM — APixel Visuals, Nov 10 '17 at 18:24
it is not an integer. Integer limit seems to be this 9007199254740991 your is bigger. try to investigate how to treat it type refernced with different type — Fabio Guerrazzi, Nov 10 '17 at 18:29
Post a clear and *minimal* example that someone can reproduce easily. We don't know what data your `resultData` Array holds — nicholaswmin, Nov 10 '17 at 18:29

score 2 · Accepted Answer · answered Nov 10 '17 at 18:27

2

I think you reach the javascript number limit which seems to be 9007199254740992 and 89819672607051330000 > 9007199254740992.

See What is JavaScript's highest integer value that a number can go to without losing precision?

answered Nov 10 '17 at 18:27

vanessa

419
1
4
13

sure enough, lowering the number to 10 digits fixed it! thanks so much for the response :) – APixel Visuals Nov 10 '17 at 18:31

JavaScript - Adding 2 integers simply doesn't do anything

1 Answers1