"Almost" functional programming (typed for TypeScript) utils methods

Why

Wrapping all the methods I usually put within a functional.js file inside my projects, as node module. BTW this is a nice way to make mistake and learn more about functional programming.

Install

$ yarn add phunctional

Usage

The library can be used both with normal JavaScript and TypeScript.

const {switchcase} = require('phunctional');

const awesomeSwitch = {
	aCondition: 'some value',
	anotherCondition: 'some other value'
};

const res = switchcase(awesomeSwitch)('a default value')('aCondition');
console.log(res);
// => some value

Methods

switchcase

Simple switch but composable with object literals. It also can run a function.

Object -> Any -> String

expand

• Object: object of cases to analyze
• Any: default case as anything you need
• String: key to check

return case | defaultCase

Returns the choosen case or the defaultCase

map

Classic map on array but without side effects.

Function -> Array

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• Function: function to handle the map
• Array: array of items

return [T] | []

Returns an empy array if the array passed is not valid.

pEach

forEach that returns a Promise and can also handle a delay between iterations.

(Array, [Number]) -> Function -> Promise

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• Array: array of items to iterate

• Number: delay in milliseconds to run each iteration and wait

• Function: function to handle the single item

return Promise

Returns a Promise with an array of the results of every iteration.

License

MIT © LasaleFamine