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What will val1 and val2 equal after the code below is executed? Explain your answer.

Why can you safely use a string as a hash key, even though a string is mutable?

Explain redo vs. retry usage

What are two uses of ranges?

What is the main difference between procs and lambdas?

What is the difference between Kernel#require and Kernel#load ?

What is the difference between Module#remove_method and Module#undef_method ?

What is the difference between Array#map and Array#each ?

What is the difference between calling "super" and calling "super()"

What is an iterator?

Why might you want to avoid using string literals within loops?

What does a bang ! at the end of a method signify?

What is the difference between throw/catch and raise/rescue ?

What will be the value of ...

Why might you want to alias a method?

What is the difference between #== and #equal? ?

What is the difference between Proc invocation and lambda invocation?

How is the invocation of a private method different than the invocation of a public method from within its
defining class?

When might you use the do / end syntax versus using the curly bracket syntax for a block?

How does block invocation differ from method invocation?

What are some disadvantages of a case statement versus repeated elsif
statements?

Which operator must be defined in order to implement the Comparable module?

What is the difference between #== and #eql? ?

Can you tell me the three levels of method access control for classes and modules? What do they imply
about the method?

Explain this ruby idiom: a ||= b

What is a Proc?

What does self mean?

Describe a closure in Ruby