Iterators: loop, for, each, & times.

iterators.rb

# An iterator is a Ruby method that repeatedly invokes a block of code.

# The 'break' keyword: Your Get Out of Jail Free card: it breaks a loop as soon as its condition is met.


# The 'Loop' method: The simplest iterator is the loop method. 

loop { print "Hello, world!" } # WARNING! Infinite loop!

i = 0
loop do
  i += 1
  print "#{i}"
  break if i > 5 #Break!
end


# "The 'Next' keyword: Used to skip over certain steps in the loop. 

for i in 1..5
  next if i % 2 == 0
  print i
end

#=> 1 3 5


# The 'Each' method: Applies an expression to each element of an object, one at a time. 

object.each do |item| 
  #Do something 
end

# The 'Times' method: A super compact for loop: it can perform a task on each item in an object a specified number of times.

10.times { puts "Milan" }

#=> Milan Milan ...