eslint-plugin-fp-challenge

Enforce rules of Functional Programming challenge

Installation

You'll first need to install ESLint:

$ npm i eslint --save-dev

Next, install eslint-plugin-fp-challenge:

$ npm install eslint-plugin-fp-challenge --save-dev

Note: If you installed ESLint globally (using the -g flag) then you must also install eslint-plugin-fp-challenge globally.

Usage

Add fp-challenge to the plugins section of your .eslintrc configuration file. You can omit the eslint-plugin- prefix:

{
  "plugins": ["fp-challenge"]
}

Then configure the rules you want to use under the rules section.

{
  "rules": {
    "fp-challenge/no-self-reference": "error",
    "fp-challenge/no-calling-object-members": [
      "error",
      { "except": ["console.log"] }
    ],
    "fp-challenge/no-use-function": "error",
    "fp-challenge/no-mutable-state": "error",
    "fp-challenge/single-argument": "error"
  }
}

Supported Rules

• no-self-reference prevents recursion to itself by name.
• no-calling-object-members prevents usage of .map, .sort, .reduce. To force using plain functions instead (and prevent side-effects)
• no-use-function promote using lambda's since they are more readable when using a single statement and a single argument.
• no-mutable-state prevent assigning new values.
• single-argument promote currying instead of using multiple arguments.

Use the whole challenge configuration

{
  "plugins": ["fp-challenge"],
  "extends": ["plugin:fp-challenge/recommended"]
}