Loops in Ruby

loops.rb

# loops in Ruby


# While

x = 10
while x >= 0 do
	puts x
	x = x - 1
end

#--------------------------------------------------------------------------------------------------------------------------------

puts("\n")



# Until

x = 0
until x > 10 do
	puts x
	x = x + 1
end

#--------------------------------------------------------------------------------------------------------------------------------

puts("\n")



# While as a modifier

x = 5
puts x = x + 1 while x < 10

#--------------------------------------------------------------------------------------------------------------------------------

puts("\n")



# Until as a modifier

a = [1,2,3]

puts a.pop until a.empty? # behaves like a stack.. the op is in LIFO manner

#--------------------------------------------------------------------------------------------------------------------------------

#for loop implementation..

puts("\n")

array = [ 1, 2, 3, 4, 5 ]

for element in array # note the use of built in keywords like element simplifies our usage..
	puts element # making ruby more simpler to use
end

puts("\n")

hash = { :a => 1, :b => 2, :c => 3 } # here key and value are built in keywords wrt hashes in Ruby..
for key,value in hash
	puts "#{key} => #{value}"
end

#--------------------------------------------------------------------------------------------------------------------------------

loops_output

10
9
8
7
6
5
4
3
2
1
0

0
1
2
3
4
5
6
7
8
9
10

6
7
8
9
10

3
2
1

1
2
3
4
5

a => 1
b => 2
c => 3

[test](http://apidock.com/ruby/Symbol/to_i_) this out test this out

[test](http://apidock.com/ruby/Symbol/to_i_) this out

to_i returns an integer representation of an object.