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Ruby

Kevin Zheng
Kevin Zheng
670 Points

why is the output still containing all the variable?

hash={"name"=>"jason","location"=>"Treehouse"}
#hash.keep_if { |key, value|  key=="name"}
#hash.reject{|key,value| key=="name"}
#hash={"name"=>"jason","location"=>"Treehouse"}
hash.select{|key,value| key=="name"}
puts hash

why is the output like this : {"name"=>"jason", "location"=>"Treehouse"} ?

I think it should be just {"name"=>"jason"}

1 Answer

Hi Kevin,

select doesn't modify the hash but returns a new hash instead. So if you want to print the result then you either need to save it in a variable and print that or print the return result directly.

puts hash.select{|key,value| key=="name"}

On the other hand, select! will modify the hash and it works the same as keep_if except that select! will return nil if the hash wasn't changed.