Loops: while, until, & for

loops.rb

# The 'For' Loop:
# A while loop checks to see if a certain condition is true, and while it is, the loop keeps running. 
# As soon as the condition stops being true, the loop stops! Beware infinite loops!

counter = 1
while counter < 11
  puts counter
  counter = counter + 1
end

#=> 1 2 3..10


# The "Until" Loop:
# The until loop is a complement to the while loop. It's sort of like a backwards while loop.

counter = 1
until counter > 10
  puts counter
  counter += 1
end

#=> 1 2 3..10


#The 'For' Loop
# Sometimes you do know how many times you'll be looping, however, and when that's the case, you'll want to use a for loop.

for variable in range #.. or ...
  puts variable
end

for num in 1..10
  puts num
end

#=> 1 2 3..10