Comparison between Ruby1.8.6 and Ruby1.9.1
| Number | RUBY_VERSION => 1.8.6 | RUBY_VERSION => 1.9.1 |
|---|---|---|
| 1 | “ruby”[0] #=>114 | “ruby”[0] #=> “r” |
| 2 | “ruby”.unpack(‘U*’) #=> [114,117,98,121] |
“ruby”.unpack(‘U*’) #=> [1603,1604,1605,1575,1578] |
| 3 | item=1 2.upto(4) do |item| p item end # Outputs: # 2 # 3 # 4 item #=> 4 |
item=1 2.upto(4) do |item| p item end # Outputs: # 2 # 3 # 4 item #=> 1 |
| 4 | d=2 -> {d = 1 }.() d #=> 1 (changed the outer variable) |
d=2 -> (;d) {d=1}.() d #=> 2 (this didn’t, but you still get the shadowing warning) |
| 5 | conferences.select do |name, _| name == :lsrc end #=> [[:lsrc, “Austin”]] |
conferences.select do |name, _| name == :lsrc end #=> {:lsrc => “Austin”} |
| 6 | conferences.select do | data| p data end # [:lsrc, “Austin”] # [:scotland_on_rails, “Edinburgh”] # [:railsconf_europe, “Berlin”] (warning : multiple valiues for a block parameter(2 for 1 ) |
conferences.select do | data| p data end # :lsrc # :scotland_on_rails # :railsconf_europe conferences.select do | name,city| p [name,city] end # [:lsrc, “Austin”] |
| 7 | >> {‘name’, “Akhil”} => {“name”=>”Akhil”} >> {‘name’, “Akhil”} => {“name”=>”Akhil”} |
1. >> {‘name’, “Akhil”} => syntax error, unexpected ‘,’, expecting tASSOC >> {name: “Akhil”} >> {name: “Akhil”} |
| 8 | >> hash = {:a=> ‘A’, :b=>’B’, :c=>’C’, :d=>’D’} => {:b=>”B”, :c=>”C”, :d=>”D”, :a=>”A”} >> hash.to_a => [[:b, “B”], [:c, “C”], [:d, “D”], [:a, “A”]] >> hash.keys => [:b, :c, :d, :a] >> hash.values => [“B”, “C”, “D”, “A”] >> hash = {:a=> ‘A’, :b=>’B’, :c=>’C’, :d=>’D’} => {:b=>”B”, :c=>”C”, :d=>”D”, :a=>”A”} >> hash.to_a => [[:b, “B”], [:c, “C”], [:d, “D”], [:a, “A”]] >> hash.keys => [:b, :c, :d, :a] >> hash.values => [“B”, “C”, “D”, “A”] |
>> hash = {:a=> ‘A’, :b=>’B’, :c=>’C’, :d=>’D’} => {:a=>”A”, :b=>”B”, :c=>”C”, :d=>”D”} >> hash.to_a => [[:a, “A”], [:b, “B”], [:c, “C”], [:d, “D”]] >> hash.keys => [:a, :b, :c, :d] >> hash.values => [“A”, “B”, “C”, “D”] >> hash = {:a=> ‘A’, :b=>’B’, :c=>’C’, :d=>’D’} => {:a=>”A”, :b=>”B”, :c=>”C”, :d=>”D”} >> hash.to_a => [[:a, “A”], [:b, “B”], [:c, “C”], [:d, “D”]] >> hash.keys => [:a, :b, :c, :d] >> hash.values => [“A”, “B”, “C”, “D”] |
| 9 | >> hash = {:a=> 1, :b=>2, :c=>3, :d=>4} => {:b=>2, :c=>3, :d=>4, :a=>1} >> hash.to_s => “b2c3d4a1” >> hash = {:a=> 1, :b=>2, :c=>3, :d=>4} => {:b=>2, :c=>3, :d=>4, :a=>1} >> hash.to_s => “b2c3d4a1” |
>> hash = {:a=> 1, :b=>2, :c=>3, :d=>4} => {:a=>1, :b=>2, :c=>3, :d=>4} >> hash.to_s => “{:a=>1, :b=>2, :c=>3, :d=>4}” >> hash = {:a=> 1, :b=>2, :c=>3, :d=>4} => {:a=>1, :b=>2, :c=>3, :d=>4} >> hash.to_s => “{:a=>1, :b=>2, :c=>3, :d=>4}” |
| 10 | >> hash = {:a=> 1, :b=>2, :c=>3, :d=>4} => {:b=>2, :c=>3, :d=>4, :a=>1} >> hash.each{|x| p x} [:b, 2] [:c, 3] [:d, 4] [:a, 1] => {:b=>2, :c=>3, :d=>4, :a=>1} >> hash.each_pair{|x| p x} (irb):48: warning: multiple values for a block parameter (2 for 1) from (irb):48 [:b, 2] (irb):48: warning: multiple values for a block parameter (2 for 1) from (irb):48 [:c, 3] (irb):48: warning: multiple values for a block parameter (2 for 1) from (irb):48 [:d, 4] (irb):48: warning: multiple values for a block parameter (2 for 1) from (irb):48 [:a, 1] => {:b=>2, :c=>3, :d=>4, :a=>1} >> hash = {:a=> 1, :b=>2, :c=>3, :d=>4} => {:b=>2, :c=>3, :d=>4, :a=>1} >> hash.each{|x| p x} [:b, 2] [:c, 3] [:d, 4] [:a, 1] => {:b=>2, :c=>3, :d=>4, :a=>1} >> hash.each_pair{|x| p x} (irb):48: warning: multiple values for a block parameter (2 for 1) from (irb):48 [:b, 2] (irb):48: warning: multiple values for a block parameter (2 for 1) from (irb):48 [:c, 3] (irb):48: warning: multiple values for a block parameter (2 for 1) from (irb):48 [:d, 4] (irb):48: warning: multiple values for a block parameter (2 for 1) from (irb):48 [:a, 1] => {:b=>2, :c=>3, :d=>4, :a=>1} |
# >> hash = {:a=> 1, :b=>2, :c=>3, :d=>4} => {:a=>1, :b=>2, :c=>3, :d=>4} >> hash.each{|x| p x} [:a, 1] [:b, 2] [:c, 3] [:d, 4] => {:a=>1, :b=>2, :c=>3, :d=>4} >> hash.each_pair{|x| p x} [:a, 1] [:b, 2] [:c, 3] [:d, 4] => {:a=>1, :b=>2, :c=>3, :d=>4} >> hash = {:a=> 1, :b=>2, :c=>3, :d=>4} => {:a=>1, :b=>2, :c=>3, :d=>4} >> hash.each{|x| p x} [:a, 1] [:b, 2] [:c, 3] [:d, 4] => {:a=>1, :b=>2, :c=>3, :d=>4} >> hash.each_pair{|x| p x} [:a, 1] [:b, 2] [:c, 3] [:d, 4] => {:a=>1, :b=>2, :c=>3, :d=>4} |
| 11 | >> hash = {:a=> 1, :b=>2, :c=>3, :d=>4} => {:b=>2, :c=>3, :d=>4, :a=>1} >> hash.select{|k,v| k == :c } => [[:c, 3]] >> hash = {:a=> 1, :b=>2, :c=>3, :d=>4} => {:b=>2, :c=>3, :d=>4, :a=>1} >> hash.select{|k,v| k == :c } => [[:c, 3]] |
>> hash = {:a=> 1, :b=>2, :c=>3, :d=>4} => {:a=>1, :b=>2, :c=>3, :d=>4} >> hash.select{|k,v| k == :c } => {:c=>3} |
| 12 | Not Available | “his name is Raveendran”.match(/name is(?\S+)/ )[:name] #=> “Raveendran” |
| 13 | Not Available | File.read(“input.txt”).encoding #=> # |
| 14 | Not Available | File.read(“input.txt”, encoding: ‘ascii-8bit’).encoding # => # |
| 15 | Not Available | result = File.open(“input.txt, “r:euc-jp”) do |f| f.read end result.encoding # => # result.valid_encoding? # => true |
| 16 | Not Available | %w(Jazzez Ravi Kumar).map.with_index do |name,offset| “{name} is #{offset +1}” end #=> [“Jazzez is #1″,”Ravi is #2″,”Kumar is #3”] |
| 17 | Not Available | [1,2,3,4].reduce(:+) #=> 10 (Symbol or Symbol#to_proc) [1,2,3,4].reduce(&:+) #=> 10 |
| 18 | Not Available | array=[1,2,3,4,5] array.take(3) #=> [1,2,3] array #=> [1,2,3,4,5] |
| 19 | Not Available | array=[1,2,3,4,5] array.drop(3) #=> [4,5] array #=> [1,2,3,4,5] |
| 20 | Not Available | :foo[1] #=> “o” |
| 21 | Not Available | :this === “this” #=> true |
Raveendran 