sergueyarellano

func addTwo(_ num: Int) -> Int {
    return num + 2
}

addTwo(2) // 4
addTwo(3) // 5

sergueyarellano

func partialAdd(_ fixed: Int) -> (Int)->Int {
    return { (num) -> Int in num + fixed}
}

let addTwo = partialAdd(2)
let addThree = partialAdd(3)
let addALot = partialAdd(284)

addTwo(3) // 5
addThree(5) // 8

sergueyarellano

addTwo(addThree(addTwo(1))) //8

sergueyarellano

func pipe(_ fns: (Int) -> (Int)...) -> (Int) -> (Int) {
   return { (input) in fns.reduce(input, {value, fn in fn(value)})}
}

pipe(addOne, addOne)(1) // 3
pipe(addOne, addTwo, addOne)(1) // 5

sergueyarellano

func pipe<T>(_ fns: (T) -> (T)...) -> (T) -> (T) {
   return { (input) in fns.reduce(input, {value, fn in fn(value)})}
}

func addPrefix(_ prefix: String) -> (String) -> (String) {
    return {(inputStr) in "\(prefix) \(inputStr)" }
}

func addSuffix(_ suffix: String) -> (String) -> (String) {
    return {(inputStr) in "\(inputStr), \(suffix)" }

sergueyarellano

pipe(
  getToken,
  makeRequest,
  mapResponse,
  sendReactiveSignal
)(requestObject)

sergueyarellano

module.exports = {
  replaceParams,
  composeURL,
  ...
}

sergueyarellano

const template = 'api/{id}/{action}'
const params =  {id: 123, action: 'run'}
const endpoint = replaceParams(template, params) // api/123/run
const host = process.env.HOST
const uri = composeUrl(host, endpoint) // http://api.name.com/api/123/run
const requestOptions = { uri }

sergueyarellano

module.exports = {
  method1,
  method2,
  ...
}
function method1 () {}
function method2 () {}

sergueyarellano

// pipe :: [any -> any] -> any -> any
pipe(
  executeFirst,
  executeSecond
)(initialValue)