Currying in Functional JavaScript.

currying.js

var greetCurried = function(greeting) {
  return function(name) {
    console.log(greeting + ", " + name);
  };
};

var greetHello = greetCurried("Hello");
//console.log('greetHello: ' + greetHello());
greetHello("Heidi"); //"Hello, Heidi"
greetHello("Eddie"); //"Hello, Eddie"

greetCurried("Hi there")("Howard"); //"Hi there, Howard"

///
console.log('\n');

var greetDeeplyCurried = function(greeting) {
  return function(separator) {
    return function(emphasis) {
      return function(name) {
        console.log(greeting + separator + name + emphasis);
      };
    };
  };
};

var greetAwkwardly = greetDeeplyCurried("Hello")("...")("?");
greetAwkwardly("Heidi"); //"Hello...Heidi?"
greetAwkwardly("Eddie"); //"Hello...Eddie?"
//--
greetDeeplyCurried("Hello")("...")("?")("Carlos");
//--
var sayHello = greetDeeplyCurried("Hello")(", ");
sayHello(".")("Heidi"); //"Hello, Heidi."
sayHello(".")("Eddie"); //"Hello, Eddie."
//--
var askHello = sayHello("?");
askHello("Heidi"); //"Hello, Heidi?"
askHello("Eddie"); //"Hello, Eddie?"

///
console.log('\n');

var curryIt = function(uncurried) {
  var parameters = Array.prototype.slice.call(arguments, 1);
  return function() {
    return uncurried.apply(this, parameters.concat(
      Array.prototype.slice.call(arguments, 0)
    ));
  };
};

var greeter = function(greeting, separator, emphasis, name) {
  console.log(greeting + separator + name + emphasis);
};

var greetHello = curryIt(greeter, "Hello", ", ", ".");
greetHello("Heidi"); //"Hello, Heidi."
greetHello("Eddie"); //"Hello, Eddie."

var greetGoodbye = curryIt(greeter, "Goodbye", ", ");
greetGoodbye(".", "Joe"); //"Goodbye, Joe."

//https://www.sitepoint.com/currying-in-functional-javascript/