The fastest Big Number library for React Native.
- 🏎️ Up to 300x faster than all other solutions
- ⚡️ Lightning fast implementation with pure C++ and JSI
- 🧪 Well tested in JS and C++ (OpenSSL)
- 💰 Made for crypto apps and Wallets
- 🤌 Up to 5x smaller in JS-bundle size
- 🔢 Store numbers as big as your Phone's RAM can store
- 🔁 Easy drop-in replacement for BN.js
yarn add react-native-bignumber
cd ios && pod install
expo install react-native-bignumber
expo prebuildThe exposed BN class is used to create new BigNumber instances from strings (binary, hex, decimal), ArrayBuffers, Buffers, numbers, or other BigNumber instances.
import { BN } from 'react-native-bignumber'
const a = new BN(3274556)
const b = new BN(9856712)
const c = a.mul(b) // 32.276.355.419.872Refer to BN.js' documentation for a full API reference and usage guide.
For example, this is how you calculate large Fibonacci numbers:
function fibonacci(n: number): BN {
let prev = new BN(0)
let prevPrev = new BN(1)
let number = new BN(1)
for (let i = 1; i < n; i++) {
prevPrev = prev
prev = number
number = prevPrev.add(prev)
}
return number
}
const f = fibonacci(50) // 12.586.269.025Since popular libraries like ethers.js or elliptic use BN.js under the hood, react-native-bignumber exposes exactly the same API as BN.js so it can be used as a drop-in replacement and promises much greater speed at common crypto operations.
In your babel.config.js, add a module resolver to replace bn.js with react-native-bignumber:
+const path = require('path');
module.exports = {
presets: ['module:metro-react-native-babel-preset'],
plugins: [
+ [
+ 'module-resolver',
+ {
+ alias: {
+ 'bn.js': 'react-native-bignumber',
+ },
+ },
+ ],
...
],
};Now, all imports for bn.js will be resolved as react-native-bignumber instead.
In the Exodus app, this single line change reduced app launch time by 4 seconds! 🚀
Join the Margelo Community Discord to chat about react-native-bignumber or other Margelo libraries.
This library is supported by Exodus. Send, receive, and exchange Bitcoin and 160+ cryptocurrencies with ease on the world's leading Desktop, Mobile and Hardware crypto wallets: exodus.com
react-native-bignumber was built at Margelo, an elite app development agency. For enterprise support or other business inquiries, contact us at [email protected]!
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