Ruby get object keys as array

Question

I am new to Ruby  if I have an object like this     apple    gt   fruit    carrot    gt   vegetable     How can I return an array of just the keys     apple    carrot

User · Answer

An alternative way if you need something more (besides using the keys method):

hash = {"apple" => "fruit", "carrot" => "vegetable"}
array = hash.collect {|key,value| key }

obviously you would only do that if you want to manipulate the array while retrieving it..

User · Answer

Use the keys method    apple    gt   fruit    carrot    gt   vegetable   keys      apple    carrot

User · Answer

hash     apple    gt   fruit    carrot    gt   vegetable   array   hash keys      gt    apple    carrot     it s that simple

User · Answer

Like taro said  keys returns the array of keys of your Hash   http   ruby-doc org core-1 9 3 Hash html method-i-keys  You ll find all the different methods available for each class   If you don t know what you re dealing with    puts my unknown variable class to s   This will output the class name

[ruby] Ruby get object keys as array

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