Ensue NPM | npm.io

ensue

Ensue performs left-to-right function composition and works like the pipe operator, more common in functional programming languages.

Ensue turns

const seo = data => c(b(a(data)))

into linear form

seq=P( a, b, c )
seq( data )

or even array for steps

seq= a, b, c
ensue( seq )( data )

Also lib supports nested array of pipes, so you can describe your sequences as simple function lists

Install

npm install --save ensue

Usage

Let's write some short sequences

import E from 'ensue'
import R from 'ramda'

//Simple validation
const hasStringId = [
  R.propOr(null,'id'),
  R.is(String)
]
//Another sequence: selector
const getUsers = [
  R.prop('users'),
  R.values,
  R.reject( R.has('inactive') )
]

Now we can use composition to get new sequences

const checkLastId = [
  getUsers,
  R.last,
  hasStringId
]

//Make native function with ensue
const validator = E(checkLastId)

function stateToProps(state) {
  return {
    flag: validator(store)
  }
}