Installation

To install the latest version: npm i duck-fp

Namespaces auto import

Install ts-namespace-import-plugin: npm i -D @unsplash/ts-namespace-import-plugin

Extend from namespaces tsconfig:

// tsconfig.json
{
  "extends": "./node_modules/duck-fp/tsconfig.namespaces.json"
}

Use project typescript version in vscode press Ctrl + Shift + p then running TypeScript: Select TypeScript Version command, and selectin Use Workspace Version refering to this

Examples

• Imagine you have a piece of text that represents data in JSON format (like a configuration file or an API response).
• The parse function takes this text as input.
• Inside the function, it tries to convert the text into a JavaScript object using JSON.parse.
• If successful, it returns the either right parsed object.
• If there’s an issue (for example, the text isn’t valid JSON), it returns either left containing Error instead.
• We are using toError function that takes anything then stringifies it and wraps in Error to handle catch block
• Why Use This?
  • The tryCatch approach is useful because it gracefully handles potential errors without crashing our program using Either monad. It’s like saying, “Hey, let’s try to parse this JSON, and if anything goes wrong, we’ll handle it gracefully.”

import { toError, tryCatch } from 'duck-fp/either'

const parse = (text: string) => {
  return tryCatch(() => JSON.parse(text), toError)
}

• Maybe
• Either
• Observable
• Lens
• Prism
• Task Either

License

The MIT License (MIT)