Why are these two variables equal in JavaScript?

Question

I declared two variables like this and tried to compare them like this

var x  = 9999999999999999;
var y  = 10000000000000000;
x == y //returns true

What is the reason for this behavior?

The question is rather "why is `9999999999999999` being rounded to `10000000000000000`" (check your JS console). — h2ooooooo, Nov 04 '13 at 12:28
Yes, just reframed that as this. I observed the behaviour that you mentioned. — Narendra Yadala, Nov 04 '13 at 12:29
http://stackoverflow.com/questions/307179/what-is-javascripts-max-int-whats-the-highest-integer-value-a-number-can-go-t/7179733#7179733 — Damodaran, Nov 04 '13 at 12:29
Worth reading: http://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html — Roko C. Buljan, Nov 04 '13 at 12:37
It helps you, http://stackoverflow.com/questions/307179/what-is-javascripts-max-int-whats-the-highest-integer-value-a-number-can-go-t/7179733#7179733 — Krish R, Nov 04 '13 at 12:37

score 1 · Accepted Answer · edited May 23 '17 at 12:03

1

Check this out:

"Javascript doesn't have integers, only 64-bit floats - and you've ran out of floating-point precision."

Thanks to the member Kos.

edited May 23 '17 at 12:03

Community

answered Nov 04 '13 at 12:33

Matheus Gelinski

1 Answers1