What's the 'Ruby way' to iterate over two arrays at once
More of a syntax curiosity than a problem to solve... I have two arrays of equal length, and want to iterate over them both at once - for example, to output both their values at a certain index. @budget = [ 100, 150, 25, 105 ] @actual = [ 120, 100, 50, 100 ] I know that I can use each_index and index into the arrays like so: @budget.each_index do |i| puts @budget[i] puts @actual[i] end Is there a
Arrays in Ruby: Take vs Limit vs First
Suppose you have an array of objects in Rails @objects If I want to display the first 5 objects, what is the difference between using: @objects.limit(5) @objects.take(5) @objects.first(5) I am talking about the front end (Ruby), NOT SQL. The reason why the objects are not limited in SQL is because the same array may be used elsewhere without applying a limit to it. Does it have anything to do with
How do I search within an array of hashes by hash values in ruby?
I have an array of hashes, @fathers. a_father = { "father" => "Bob", "age" => 40 } @fathers << a_father a_father = { "father" => "David", "age" => 32 } @fathers << a_father a_father = { "father" => "Batman", "age" => 50 } @fathers << a_father How can I search this array and return an array of hashes for which a block returns true? For example: @fathers.some_method("age" > 35) #=> array containing
Unique on an array of hashes based on value
I feel like this could be improved (a common feeling in ruby). I'm trying to uniq an array of hashes based on value. In this example, I want the colors of the elements. Moss and snow are impostors. # remove unique array of hashes based on a hash value a = [ { :color => "blue", :name => "water" }, { :color => "red", :name => "fire" }, { :color => "white", :name => "wind" }, { :color => "green", :na
Rubyでハッシュの配列によるソート - hogemaru さわやか日記
ハッシュの配列をソートしたいときに詰まったのでメモ サンプルソース hogeArray = Array.new #input p "Before" for j in 1..10 hogeHash = Hash.new hogeHash['id'] = rand(1024) hogeHash['huga'] = 'hogehoge' p "id:#{hogeHash['id']} huga:#{hogeHash['huga']}" hogeArray.push hogeHash end #sort hogeArray = hogeArray.sort_by{|val| val['id']} p "After" hogeArray.each do |hogeHash| p "id:#{hogeHash['id']} huga:#{hogeHash['huga']}" end 実行結果 "Bef
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