JS Curry Demo

curry.js

/**
 * Curry function that will prepend given arguments to the provided function
 * before being run.
 * 
 * (Technically this isn't true curry'ing, but it makes enough sense to call it that here for now)
 *
 * @param  {[Function]} func
 * @param  {...[mixed]} args
 * @return {[Function]}
 */
function curry(func, ...args) {
  return function () {
    func.apply(null, arr.concat(Array.from(arguments)))
  }
}

const client = 'Client Object'
const otherThing = 'Other Thing'

// Create our function handler that will be given the client first
const handler = function (client, otherThing) {
  console.log(client)
  console.log(otherThing)
}

// Use the curry method to create a new function that injects the client as the first param when run
const newHandler = curry(handler, client)

// Call the handler
newHandler(otherThing) // Should log 'Client Object' and then 'Other Thing', even though at call-time we only passed the otherThing variable