Kata

Create a function method that allow you to wrap an existing function. The method signature would look something like this:

Usage Example:

function speak(name){
   return "Hello " + name;
}

speak = speak.wrap(function(original, yourName, myName){
   greeting = original(yourName);
   return greeting + ", my name is " + myName;
})

var greeting = speak("Mary", "Kate");

Kata

Description:

This is the first part of three (part2, part3).

Generators and Iterators are new ES6 features that will allow things like this:

function* fibonacci() {
    let [prev, curr] = [0, 1];
    for (;;) {
        [prev, curr] = [curr, prev + curr];
        yield curr;
    }
}

Using them in this way, we can do amazing things:

let seq = fibonacci();
print(seq.next()); // 1
print(seq.next()); // 2
print(seq.next()); // 3
print(seq.next()); // 5
print(seq.next()); // 8

This is powerful, but until a few months later, ES6 will not be born.

The goal of this kata is to implement pseudo-generators with ES5.