Types

Massa AS-types package (@massalabs/as-types) contains assemblyscript objects designed to facilitate the writing of smart contracts.

Note

You know a nugget that could be added to this list or you have a specific need for a new type? Open an issue to discuss about it!

Currency

A representation of a monetary unit used to express a value.

Usage

import { Currency } from '@massalabs/as-types';

const euro = new Currency("Euro", 2);
const yen = new Currency("Japanese yen", 0);
const isSame = euro.sameAs(yen); // False

More info in the Currency documentation.

Amount

A representation of a value in a Currency.

Usage

import { Amount, Currency } from '@massalabs/as-types';

const euro = new Currency("Euro", 2);

const price = new Amount(500, euro);
const accountBalance = new Amount(100, euro);

cont isEnough = price.lessThan(accountBalance); // False
const isValidAmount = accountBalance.substract(price).isValid(); // False

Args

A class used to serialize and deserialize arguments (of functions, data to/from storage…).

Usage

Serialization

import { Address, call } from '@massalabs/massa-as-sdk';

const address = new Address(
    'A17vYbpxBxiwNgYM4WgnLyMwNzj8vp5t13QMJvZMbhGyJyysxs6',
);
const stringArgument = "myStringArgument!"
call(address, 'mySCFunction', new Args().add(stringArgument), 0);
...

Deserialization

import { Args } from '@massalabs/as-types';

export function sayHello(args: StaticArray<u8>): void {
const stringArgument = new Args(args).nextString().unwrap();
...

See all Args methods and supported types for serialization/deserialization in the Args documentation.