curry.js

// an ordinary function
var sum = function(a, b){return a+b}
sum(1, 3) // 4

// a curried version of that sum
var curriedSum = function(a){
  return function(b){return a+b}
}

var plusOne = curriedSum(1) // function(b) {return a+b}
plusOne(3) // 4
plusOne(1) // 2 -> plusOne is useful outside it's original scope


// a simple function to curry any other function 
// we'll use this in future
// DO NOT USE THIS IN PRODUCTION
var curry = function(uncurriedFn){
  var argumentsCall = []
  return function curriedFn(){
    var args = Array.prototype.slice.call(arguments)
    if (args.length > 0) {
      argumentsCall = argumentsCall.concat(args)
      if (uncurriedFn.length == argumentsCall.length) {
        return uncurriedFn.apply(this, argumentsCall)
      }
    } 
    return curriedFn
  }
}

// an usage example of curry
var curriedAjax = curry(function(method, path){
  return $.ajax(path, {method: method})
})

var ajaxGET = curriedAjax('GET')
var allUsers = ajaxGET('/users')
var allStars = ajaxGET('/stars')