An Effect monad library. Allows you to defer dealing with impurities until you actually run them.

const SideEffector = require('side-effector')

import SideEffector from 'side-effector'

<script src="https://cdn.jsdelivr.net/npm/[email protected]/side-effector.min.js"></script>

To create a SideEffector, give it a function.

const lazyZero = SideEffector(() => 0)

To apply a function to this object, we use the map() method. It's important to remember that the function will not be immediately applied.

const toAddOne = lazyZero.map(x => x + 1)
const toDisplayPlusOne = toAddOne.map(x => console.log(x + 1))

To actually run the side effects, we use the run() method like this:

toDisplayPlusOne.run() // 2

Derived from James Sinclair's post, How to Deal with Dirty Side-Effects in Your Pure Functional JavaScript.

MIT