Boolean Logic Exercises

1. Define a method, odd_integer?, that accepts an integer, n, as an argument. Your method should return true or false based on whether n is odd or even. Do not use the built in #odd? method. Instead, think about how you could use the modulo operator, %, to determine whether an integer is odd or even.

    odd_integer?(5) # ==> true
    odd_integer?(6) # ==> false

2. Define a method, before_tarantula?, that accepts a string as an argument. The method should return true if the argument comes before the word "tarantula" alphabetically.

    before_tarantula?("baboon") # ==> true
    before_tarantula?("tarantula") # ==> false
    before_tarantula?("yak") # ==> false

3. Here is an example of a truth table:

Fill out the following truth table:

4. Define a method, #same_type? that accepts any two objects as arguments. Your method should return true if both objects are the same type (String, Fixnum, etc.). Otherwise, return false.

    same_type?(5, "abc")    # ==> false
    same_type?(5, 10)       # ==> true
    same_type?(5.0, 10)     # ==> false
    same_type?(true, false) # ==> false
    same_type?(nil, nil)    # ==> true

To aid you in solving this problem, you can use the #class method, which tells you which class a ruby object belongs to.

    5.class     # ==> Fixnum
    "abc".class # ==> String