Ruby Programming Examples

getting component

ruby

#!/usr/bin/ruby -w

time = Time.new

# Components of a Time
puts "Current Time : " + time.inspect
puts time.year    # => Year of the date 
puts time.month   # => Month of the date (1 to 12)
puts time.day     # => Day of the date (1 to 31 )
puts time.wday    # => 0: Day of week: 0 is Sunday
puts time.yday    # => 365: Day of year
puts time.hour    # => 23: 24-hour clock
puts time.min     # => 59
puts time.sec     # => 59
puts time.usec    # => 999999: microseconds
puts time.zone    # => "UTC": timezone name

current date

ruby

#!/usr/bin/ruby -w

time1 = Time.new
puts "Current Time : " + time1.inspect

# Time.now is a synonym:
time2 = Time.now
puts "Current Time : " + time2.inspect

hash builtin method

ruby

#!/usr/bin/ruby

$, = ", "
months = Hash.new( "month" )
months = {"1" => "January", "2" => "February"}

keys = months.keys
puts "#{keys}"

hashes example

ruby

#!/usr/bin/ruby

H = Hash["a" => 100, "b" => 200]

puts "#{H['a']}"
puts "#{H['b']}"

creating hashes

ruby

#!/usr/bin/ruby

months = Hash.new( "month" )

puts "#{months[0]}"
puts "#{months[72]}"

array builtin

ruby

#!/usr/bin/ruby

digits = Array(0..9)
num = digits.at(6)
puts "#{num}"

array pack

ruby

a = [ "a", "b", "c" ]
n = [ 65, 66, 67 ]
puts a.pack("A3A3A3")   #=> "a  b  c  "
puts a.pack("a3a3a3")   #=> "a\000\000b\000\000c\000\000"
puts n.pack("ccc")      #=> "ABC"

kernel module

ruby

#!/usr/bin/ruby

digits = Array(0..9)
puts "#{digits}"

ruby block evaluate

ruby

#!/usr/bin/ruby

nums = Array.new(10) { |e| e = e * 2 }
puts "#{nums}"

assigning value

ruby

#!/usr/bin/ruby

names = Array.new(4, "mac")
puts "#{names}"

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