exbanking

A simple NPM package banking application written in Typescript language.

API Reference

const createUser = (username: string): OK | BankingError => {}

• Function creates new user in the system
• New user has zero balance of any currency

const deposit = (username: string, amount: number, currency: string): (Ok & { newBalance: number } | BankingError) => {};

• Increases user's balance in given currency by amount value
• Returns newBalance of the user in given format

const withdraw = (username: string, amount: number, currency: string): (Ok & { newBalance: number } | BankingError) => {};

• Decreases user's balance in given currency by amount value
• Returns new_balance of the user in given format

const getBalance = (username: string, currency: string): (Ok & { balance: number } | BankingError) => {};

• Returns balance of the user in given format

const send = (fromUsername: string, toUsername: string, amount: number, currency: string): (Ok & { fromUsernameBalance: number, toUsernameBalance: number } | BankingError) => {};

• Decreases fromUsername's balance in given currency by amount value
• Increases toUsername's balance in given currency by amount value
• Returns balance of fromUser and toUser in given format