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for and each loops over an array. Also sorting
Control Structures example from a Well House Consultants training course
More on Control Structures [link]

This example is described in the following article(s):
   • Process every member of an array, and sort an array - Ruby - [link]

Source code: collect Module: R104
# for and each loops over an array in Ruby. Also sorting

places = ["Whitby","Skeggy","Croatia","Maldives","Seaford","Whitby"]
places.push("Wiltshire")
places.push("Florida")
places.push("Gainsborough")

# Iterate through each element
# ----------------------------

places.each do |holiday|
        puts "A great weekend in #{holiday}"
end

# default (natural order) sort
places.sort!

for place in places
        puts "Go to #{place} for a few days"
end

# ... or iterate through the position of each element
# ---------------------------------------------------

for posn in 0...places.length
        puts "Have a break in #{places[posn]}"
        end

# sort, with a specified comparator block
places.sort! {|left,right| left.length <=> right.length}

# ... or process the whole array (map or collect)
# -----------------------------------------------

puts places.collect {|place| "Sand and sea in #{place}"}

places.collect! {|place| "Nightlife at #{place}"}
puts places

__END__

munchkin:chruby grahamellis$ ruby collect
A great weekend in Whitby
A great weekend in Skeggy
A great weekend in Croatia
A great weekend in Maldives
A great weekend in Seaford
A great weekend in Whitby
A great weekend in Wiltshire
A great weekend in Florida
A great weekend in Gainsborough
Go to Croatia for a few days
Go to Florida for a few days
Go to Gainsborough for a few days
Go to Maldives for a few days
Go to Seaford for a few days
Go to Skeggy for a few days
Go to Whitby for a few days
Go to Whitby for a few days
Go to Wiltshire for a few days
Have a break in Croatia
Have a break in Florida
Have a break in Gainsborough
Have a break in Maldives
Have a break in Seaford
Have a break in Skeggy
Have a break in Whitby
Have a break in Whitby
Have a break in Wiltshire
Sand and sea in Skeggy
Sand and sea in Whitby
Sand and sea in Whitby
Sand and sea in Florida
Sand and sea in Croatia
Sand and sea in Seaford
Sand and sea in Maldives
Sand and sea in Wiltshire
Sand and sea in Gainsborough
Nightlife at Skeggy
Nightlife at Whitby
Nightlife at Whitby
Nightlife at Florida
Nightlife at Croatia
Nightlife at Seaford
Nightlife at Maldives
Nightlife at Wiltshire
Nightlife at Gainsborough
munchkin:chruby grahamellis$

Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Ruby
 * Ruby Programming
Also available on on site courses for larger groups

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Other Examples
This example comes from our "Control Structures" training module. You'll find a description of the topic and some other closely related examples on the "Control Structures" module index page.

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