tack-on

tack-on

Some neato functions inspired by the new bind operator and functional programming.

tack

Attach a function to a thing, without hanging it directly. Great to add functionality that should have been there from the start, without the risk of mutating global objects.

What?

import mapValues from 'lodash';
import { tack } from 'tack-on';

const map = tack(mapValues);
let succ = n => n + 1;

expect({ a: 1, b: 2 }::map(succ)).to.deep.equal({ a: 2, b: 3 });

compose

Make functions composable with the bind operator. compose assumes functions that take only one argument.

What?

import { compose } from 'tack-on';

succ = compose(succ);
const pred = compose(n => n - 1);

expect(succ::pred::succ::succ::succ::pred(1)).to.equal(3)

const addThreeMorphism = succ::succ::succ;

expect(addThreeMorphism(3)).to.equal(6);