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a = [1,2,3,4] p a a << 5 p a a.push(6,7,8) p a b = [9,10,11] p a + b c = [1,1,1,1,2,2,2,2,3,3,3,4,4,4,4,5,5,5,5,5,6,6,6,6] p c.uniq #remove duplicate objects c.each {|num| print num," "} c.each_with_index{|num,index| puts "#{index}: #{num}"} #find the first object that matches a certain criteria neo = c.detect{|num| num > 2 } puts neo #old school #finding values greater than two result = [] c.each { |num| result << num if num > 2 } p result result = c.select{|num| num > 2} p result class Person attr_accessor :name,:age def initialize(name,age) @name,@age = name,age end def to_s "#{@name} and #{@age}" end end people = [Person.new("tim",89),Person.new("doug",12),Person.new("dima",27)] neo = people.find{|person| person.age == 27} puts neo myspace = people.select{|person| person.age > 14} puts myspace result = c.reject{|num| num > 2} p result result = c.select{|num| num >=2 && num <=5} p result names = ["marie","doug","dima","tim","timmy"] numbers = [1,2,3,4,5] p names #creates a new array with changed elements name_output = names.collect{|name| "<li>#{name}</li>"} p name_output puts p numbers squares = numbers.collect{|number| number*number} p squares class Pet attr_accessor :first_name,:last_name,:age def initialize(first_name,last_name,age) @first_name,@last_name,@age = first_name, last_name,age end end pets = [Pet.new("fido","doe",99),Pet.new("snoopy","johnson",34),Pet.new("hulk","hogan",65)] pets_full_name = pets.collect{|pet| "#{pet.first_name} #{pet.last_name}"} p pets_full_name #accumulate using inject sum = numbers.inject{|sum,num| sum + num} puts "sum is #{sum}" puts age_sum = pets.inject(0){|sum,pet| sum + pet.age} puts "age sum from inject is #{age_sum}" puts #uck! #age_sum = pets.collect{|pet| pet.age}.inject{|sum,age| sum + age} #puts "age sum is #{age_sum}" product = numbers.inject{|product,num| product * num} puts "product is #{product}" output = names.inject(""){|output,name| output << "<li>#{name}</li>"} puts output output = "" names.each {|name| output << "<li>#{name}</li>"} puts output