Intro to Ruby - 04 - Flow Control

Each_loop.rb

names = ["Michael", "John", "Paul", "George"]

names.each do |name|
  puts "Hi, my name is #{name}"
end

# Result:
# Hi, my name is Michael
# Hi, my name is John
# Hi, my name is Paul
# Hi, my name is George

If_statements.rb

x = 2

# Basic IF statement
if( (x % 2) == 0) then puts "#{x} is divisible by 2" end
# Result: 2 is divisible by 2

# With failure
x = 5
if( (x % 2) == 0) then puts "#{x} is divisible by 2" end
# Result: 
# The result is nothing, because 5 is not divisible by 2

# ELSE
if( (x % 2) == 0) then puts "#{x} is divisible by 2" else puts "#{x} is NOT divisible by 2" end
# Result: 5 is NOT divisible by 2

# Multiple lines
if( (x % 2) == 0) 
  puts "#{x} is divisible by 2" 
else 
  puts "#{x} is NOT divisible by 2"
end
# Result: 5 is NOT divisible by 2

# Result is the same because we didn't change any code, 
# we just spread it across multiple lines, 
# making it easier to read

While_loop.rb

x = 10

while( x > 0 ) do
  puts x
  x -= 1
end

# Result:
# 10
# 9
# 8
# 7
# 6
# 5
# 4
# 3
# 2
# 1
# => nil