JS wrong number parsing from string

Question

I'm trying to parse a big int (int64) from a string... I've set up a little test, and I'm getting the wrong number after parsing it... I only get even numbers, never odd numbers...

This is my test:

var test = "10202853558883111";
console.log(test); // outputs 10202853558883111

var iTest = parseInt(test);
console.log(iTest); // outputs 10202853558883112

var fTest = parseFloat(test);
console.log(fTest); // outputs 10202853558883112

var nTest = Number(test);
console.log(nTest); // outputs 10202853558883112

WTF?!?!?!
Could some one explain this, and more importantly, can you please help me solve it... /:

Javascript numbers are IEEE floats, with only 52 bits of precision. — Barmar, Dec 26 '13 at 18:58
http://stackoverflow.com/questions/307179/what-is-javascripts-max-int-whats-the-highest-integer-value-a-number-can-go-t — Popnoodles, Dec 26 '13 at 19:00

score 0 · Answer 1 · answered Dec 26 '13 at 19:00

0

The number is too long, and exceeds Javascript's precison. Look:

parseInt("10202853558883111")
>  10202853558883112
parseInt("1020285355888311") // One less digit
>  1020285355888311

answered Dec 26 '13 at 19:00

salezica

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At 12.4K rep why not VTC as one of the many duplicates that exist? – Martin Smith Dec 26 '13 at 19:02
You are right, I should've done that – salezica Dec 26 '13 at 19:02

JS wrong number parsing from string

1 Answers1