SetFP

Set object with native filter, map,reduce, every, and some methods. Zero Dependencies.

https://www.npmjs.com/package/setfp

Motivation

Sets don’t have these methods natively. One would first need to copy an iterator into an array [...iterator] before using .map, .filter, .reduce, every and some. SetFP allows you to use those methods natively.

Installation

npm install setfp

OR

yarn add setfp

Initialize

Javascript

const SetFP = require("setfp").default;
const test = new SetFP([0, 1, 2, 3]);

TypeScript

import SetFP from "setfp";
 
// Diamond notation needed if no arguments are provided
const test = new SetFP<number>();
 
// OR with arguments, types are inferred.
const test = new SetFP([0, 1, 2, 3]);

Usage

const filterSetToSet = test.filter((key) => key);
SetFP [Set] { 1, 2, 3 }
 
const filterSetToArray = test.filterToArray((key) => key);
[ 1, 2, 3 ]
 
const mapSetToSet = test.map((key) => 2 * key);
SetFP [Set] { 0, 2, 4, 6 }
 
const mapSetToArray = test.mapToArray((key) => 2 * key);
[ 0, 2, 4, 6 ]
 
const reduce = test.reduce((acc, curr) => acc + Number(curr), 0);
6
 
const every = test.every((key) => key < 3);
false
 
const some = test.some((key) => key < 3);
true