TuesdayWeek2

1. What alternative keyword can we use if we're negating the boolean expression inside our if?

- Unless.

2. What is the 'negative doppleganger' for while?

- Until.

3. What is a "modifier form" of an expression? (Which I call a post-conditional)

- The same expression collapsed into a single line for clutter free and more readable programming.

4. What does a case statement return by default?

- Nil.

5. What two values evaluate to false inside and If?

- False and nil.

6. What is a ternary expression used for (?:)?

- As a compact if statement.

7. What is a “guarded or” used for (||=)?

- Same as || but it reduces the length of the expression and you don't to repeat the name of the variable.

8. What’s the fastest way to make an array of words?

- %w{ one two three}  Used only if non of the strings have embedded spaces.

9. When using symbols as Hash keys, what are the two ways to initialize a Hash using the curly brace notation? (1.9 hash syntax)

- hash = { :one => 'hello', :two => 'hi' } and hash ={ one: 'hello', two: 'hi' }

10. What is the name of the * operator?

- Multiplication, (asterisk, starred parameter/argument)?

11. Should you use a for loop to iterate over an Array or Hash? If not, what’s the alternative?

- No. each method

12. What is the difference between each and map?

- Map does not make a decision based on the return from the block instead it creates a new array containing everything the block returned in order. 

13. What is a bang method?

- A method that ends with an exclamation point, which permanently modifies an object in-place. A way of saying: "beware, this method is dangerous".