Interview gist -- Can candidate write code?

gistfile1.mkd

Instructions

• Solve all problems using JavaScript

Problems

1. Write a function that returns an array with the first n powers of 2. Call it twoPow.

2. Use twoPow and Array.prototype.reduce to the sum of the first 10 powers of 2.

3. Describe this call signature:

   say("Hello")("World");  // An alert displaying, "Hello World" appears
   

4. Implement the say function from question 3.

5. Simplify the following code:

   if(foo !== '' || foo !== null || typeof foo !== 'undefined') {
       alert(foo);
   }
   

6. Write a sum function that takes any number of parameters.

This for an entry level position. For a more senior position, I'm using this gist: http://gist.github.com/633087

Yes' I'd looked at it. Classical questions, I think.
It refreshed my memory, thanks. :-)