Ruby Programming Examples

ruby collect iterator

ruby

#!/usr/bin/ruby

a = [1,2,3,4,5]
b = a.collect{|x| 10*x}
puts b

ruby each iterator

ruby

#!/usr/bin/ruby

ary = [1,2,3,4,5]
ary.each do |i|
   puts i
end

ranges as intervals

ruby

#!/usr/bin/ruby

if ((1..10) === 5)
   puts "5 lies in (1..10)"
end

if (('a'..'j') === 'c')
   puts "c lies in ('a'..'j')"
end

if (('a'..'j') === 'z')
   puts "z lies in ('a'..'j')"
end

ranges condition

ruby

#!/usr/bin/ruby

score = 70

result = case score
   when 0..40 then "Fail"
   when 41..60 then "Pass"
   when 61..70 then "Pass with Merit"
   when 71..100 then "Pass with Distinction"
   else "Invalid Score"
end

puts result

ranges implement method

ruby

#!/usr/bin/ruby

# Assume a range
digits = 0..9

puts digits.include?(5)
ret = digits.min
puts "Min value is #{ret}"

ret = digits.max
puts "Max value is #{ret}"

ret = digits.reject {|i| i < 5 }
puts "Rejected values are #{ret}"

digits.each do |digit|
   puts "In Loop #{digit}"
end

ranges as sequence

ruby

#!/usr/bin/ruby

$, =", "   # Array value separator
range1 = (1..10).to_a
range2 = ('bar'..'bat').to_a

puts "#{range1}"
puts "#{range2}"

time arithmetic

ruby

now = Time.now          # Current time
puts now

past = now - 10         # 10 seconds ago. Time - number => Time
puts past

future = now + 10  # 10 seconds from now Time + number => Time
puts future

diff = future - past     # => 10  Time - Time => number of seconds
puts diff

formatting times

ruby

#!/usr/bin/ruby -w

time = Time.new
puts time.to_s
puts time.ctime
puts time.localtime
puts time.strftime("%Y-%m-%d %H:%M:%S")

time utc

ruby

#!/usr/bin/ruby -w

time = Time.new
values = time.to_a
puts Time.utc(*values)

array component

ruby

#!/usr/bin/ruby -w

time = Time.new
values = time.to_a
p values

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