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How to deal with big numbers in javascript [duplicate]

Tags:

javascript

floating-point

decimal

bignum

biginteger

I'm looking for a Mathematical solution that deals with really (long, big, huge, storms) numbers. I haven't found anything yet, But I don't wanna think that this problem hasn't be solve at this time. I'm looking for an easy Number solution, like Microsoft Excel Precision (30 decimals), or a BigInteger (Java) solution. in Javascript of course.

like image 613
crsuarezf Avatar asked Nov 26 '10 22:11

crsuarezf

People also ask

How can you handle a very large number in JavaScript?

To store large numbers in JavaScript, use BigInt() rather than + operator.

How do you round big numbers in JavaScript?

ceil() The Math. ceil() function always rounds a number up to the next largest integer.

What is Bignumber in JavaScript?

A BigInt value, also sometimes just called a BigInt, is a bigint primitive, created by appending n to the end of an integer literal, or by calling the BigInt() function (without the new operator) and giving it an integer value or string value.

Is BigInt same as long?

The equivalent of Java long in the context of MySQL variables is BigInt. In Java, the long datatype takes 8 bytes while BigInt also takes the same number of bytes.

1 Answers

While looking for an big integer library for an ElGamal crypto implementation I tested several libraries with the following results:

I recommend this one: Tom Wu's jsbn.js (http://www-cs-students.stanford.edu/~tjw/jsbn/)

  • Comprehensive set of functions and fast

Leemon Baird's big integer library (http://www.leemon.com/crypto/BigInt.js)

  • Comprehensive set of functions and pretty fast
  • BUT: Negative number representation is buggy!

bignumber.js (https://github.com/MikeMcl/bignumber.js)

  • Pretty complete set of functions
  • BUT: Converting really big numbers from strings into BigNumber objects result in INFINITY

Scheme arithmetic library for JavaScript (https://github.com/jtobey/javascript-bignum)

  • JS-Implementation of Scheme arithmetic functions
  • BUT: No function for y= x^e mod n

I haven't tested this by myself: BigNumber (http://jsfromhell.com/classes/bignumber)

  • Functions for high precision claculations
  • BUT: It's said to be slow due to internal representation of numbers as strings
like image 62
Torben Avatar answered Oct 20 '22 08:10

Torben
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