blob: 2a9060f6e690b0e46a8c09cdd9c354093a55ebbe (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
# ====================================================================================
# Booleans
# ====================================================================================
#
# Here is how you work with numbers in Ruby. Take the text
# in this file and paste it into repl.rb and save:
repl do
puts '* RUBY PRIMER: TrueClass, FalseClass, NilClass (truthy / falsey values)'
puts "Anything that *isn't* false or nil is true."
c = 30
puts "The value of c is #{c}."
if c
puts "This if statement ran because c is truthy."
end
d = false
puts "The value if d is #{d}. The type for d is #{d.class}."
if !d
puts "This if statement ran because d is falsey, using the not operator (!)."
end
e = nil
puts "Nil is also considered falsey. The value of e is: #{e} (a blank string when printed). Which is of type #{e.class}."
if !e
puts "This if statement ran because e is nil and the if statement applied the NOT operator. !e yields a type of #{(!e).class}."
end
end
|
