# Range

# Ranges as Sequences

The most important use of ranges is to express a sequence

Syntax:

``````(begin..end) => this construct will include end value
(begin...end) => this construct will exclude end value

``````

or

``````Range.new(begin,end,exclude_end) => exclude_end is by default false

``````

Most important `end` value must be greater the `begin`, otherwise it will return nothing.

Examples:

``````(10..1).to_a            #=> []
(1...3)                 #=> [1, 2]
(-6..-1).to_a           #=> [-6, -5, -4, -3, -2, -1]
('a'..'e').to_a         #=> ["a", "b", "c", "d", "e"]
('a'...'e').to_a        #=> ["a", "b", "c", "d"]
Range.new(1,3).to_a     #=> [1, 2, 3]
Range.new(1,3,true).to_a#=> [1, 2]

``````

# Iterating over a range

You can easily do something to each element in a range.

``````(1..5).each do |i|
print i
end
# 12345

``````

# Range between dates

``````require 'date'

date1 = Date.parse "01/06/2016"
date2 = Date.parse "05/06/2016"

p "Period #{date1.strftime("%d/%m/%Y")} to #{date2.strftime("%d/%m/%Y")}"

(date1..date2).each do |date|
p date.strftime("%d/%m/%Y")
end

# "01/06/2016"
# "02/06/2016"
# "03/06/2016"
# "04/06/2016"
# "05/06/2016"

``````