Javascript: toString(36) for large integers

Question

15955067621307336078.toString(36); returns '3d7vzfy5k2as8' in Javascript because the large integer cannot be represented (the correct answer is '3d7vzfy5k29ou').

Does someone have a clever function that takes a large integer as a string and converts it to base 36?

Sewerage

@Cameron: en.wikipedia.org/wiki/Base_36 – Schaffer

Actually, I get "3d7vzfy5k2a68" for 15955067621307336078..toString(36) – Barrios

I tried writing my own base conversion function, but it stops working completely after a certain size. jsfiddle.net/SEZXq/1 – Voltammeter

@Barrios - The largest int that JavaScript supports is 9007199254740992. You're number is over that, so the answer you get is determined by how the implementation misbehave when there is overflow. See this thread. – Inellineloquent

Answer 1

Use this BigInt class, which allows conversion of arbitrarily large integers to any arbitrary base between 2 and 95. Use the bigInt2str() method to perform the conversion.

Schaffer

Thanks this worked great. bigInt2str(str2bigInt("15955067621307336078",10,0,0),36).toLowerCase(); – Sewerage

Answer 2

For anyone curious, today we are using https://github.com/MikeMcl/bignumber.js instead.

Sewerage