fp-and-or

Simple and and or functional programming predicates.

• and(...fs): (...args): boolean - Returns a predicate that returns true if all arguments are true or evaluate to true for the given input.
• or(...fs): (...args): boolean - Returns a predicate that returns true if at least one argument is true or evaluates to true for the given input.

A predicate is a function that returns a boolean, commonly used in Array.prototype.filter.

e.g.

const isEven = n => n%2 === 0
const isPositive = n => n > 0

// un-fancy
items.filter(x => isEven(x) || isPositive(x))

// fancy
items.filter(or(isEven, isPositive))

Install

npm install --save fp-and-or

Usage

const { and, or } = require('fp-and-or')

<%=usage%>