@ethersproject/constants

What is @ethersproject/constants?

@ethersproject/constants is a package that provides a collection of common constants used in Ethereum development. These constants include predefined values for addresses, hashes, and other frequently used Ethereum-related data.

What are @ethersproject/constants's main functionalities?

Addresses

Provides a constant for the zero address, which is often used as a placeholder or default address in Ethereum applications.

const { AddressZero } = require('@ethersproject/constants');
console.log(AddressZero); // Output: '0x0000000000000000000000000000000000000000'

Hashes

Provides a constant for the zero hash, which is a hash filled with zeros and is often used as a default or placeholder hash.

const { HashZero } = require('@ethersproject/constants');
console.log(HashZero); // Output: '0x0000000000000000000000000000000000000000000000000000000000000000'

Ether Units

Provides a constant for the number of wei per ether, which is useful for converting between ether and wei units.

const { WeiPerEther } = require('@ethersproject/constants');
console.log(WeiPerEther.toString()); // Output: '1000000000000000000'

Negative One

Provides a constant for the value negative one, which can be useful in various calculations and comparisons.

const { NegativeOne } = require('@ethersproject/constants');
console.log(NegativeOne.toString()); // Output: '-1'

Other packages similar to @ethersproject/constants

web3-utils

web3-utils is a utility library for Ethereum that provides various functions and constants for Ethereum development. It includes similar constants like zero address and zero hash, as well as additional utility functions for encoding, decoding, and converting data.

ethjs-util

ethjs-util is a utility library for Ethereum that provides a collection of utility functions and constants. It includes constants like zero address and zero hash, and offers additional utility functions for working with Ethereum data types and values.

ethereumjs-util

ethereumjs-util is a utility library for Ethereum that provides a wide range of utility functions and constants. It includes constants like zero address and zero hash, and offers comprehensive support for various Ethereum-related operations, including cryptographic functions and data conversions.

README

Etehreum Constants

This sub-module is part of the ethers project.

It contains many frequently used constants when dealing with Ethereum.

For more information, see the documentation.

Importing

Most users will prefer to use the umbrella package, but for those with more specific needs, individual components can be imported.

const {

    AddressZero,
    HashZero,

    EtherSymbol,

    NegativeOne,
    Zero,
    One,
    Two,

    WeiPerEther,
    MaxUint256

} = require("@ethersproject/constants");

License

MIT License