spool

spool

npm install spool

spool takes functions like this:

function add(a, b) {
  return a + b
}

function sub(a, b) {
  return a - b
}

add(sub(add(1, 9), 2), 5) // 13

and lets you call them like this:

import spool from 'spool'

const math = spool({
  add,
  sub,
})

math(1).add(9).sub(2).add(5).v // 13

That way, you can write pure functions, but call them in an OOP style... for some reason.

spool threads each return value as the first parameter to the next function. You can also use spoor to thread each return value as the last parameter to the next function.

You can even wrap mori. This is totally something you should do, and it results in a 100% better api:

import mori from 'mori'
import {spoor} from 'spool'

const m = spoor(mori)

m({foo: 1, bar: 2}).toClj().keys().toJs().v // [ 'foo', 'bar' ]

Here is another example:

import spool from 'spool'

client().artists(1).albums(2).tracks(3).get().v
// =>
// { path: ["/api/v1", "artists", 1, "albums", 2, "tracks", 3],
//   method: "GET"
// }

const client = spool({
  artists,
  albums,
  tracks,
  get,
  post,
  put,
}, {
  path: ['/api/v1'],
})

function albums(r, id) {
  return path(r, ['albums', id])
}

function artists(r, id) {
  return path(r, ['artists', id])
}

function tracks(r, id) {
  return path(r, ['tracks', id])
}

function get(r, id) {
  return method(r, 'GET')
}

function post(r, id) {
  return method(r, 'POST')
}

function put(r, id) {
  return method(r, 'PUT')
}

function method(r, method) {
  return merge(r, {method})
}

function path(r, p) {
  return nest(r, {path: p})
}

function headers(r, headers) {
  return merge(r, {headers})
}

function nest(...rs) {
  return {
    ...merge(...rs),
    path: [].concat(...rs.map(r => r.path).filter(p => p)),
  }
}

function merge(...rs) {
  return rs.reduce((o, r) => {
    for (const k in r) o[k] = _merge(o[k], r[k])
    return o
  }, {})
}

function _merge(a, b) {
  if (!a) return b
  if (!b) return a

  return typeof a === 'object' && typeof b === 'object' ? merge(a, b) : b
}