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Ruby Ruby Collections Ruby Hashes Working with Hash Keys

Posted by Nithin Rajan
Nithin Rajan
1,737 Points

Using the has_key? method, check if the hash variable has a key called "calories". If it does, set a new variable called

Using the has_key? method, check if the hash variable has a key called "calories". If it does, set a new variable called "food" to true

hash.rb 
hash = { "name" => "Bread", "quantity" => 1, "calories" => 100 }

hash.has_key?("calories")
hash["food"] = "true"

2 Answers

Steve Hunter
Steve Hunter
57,712 Points

Hi there,

This needs two stages. First, see if there is a hash called calories. If there is, set a variable to true. 

if(hash.has_key?("calories"))
  food = true
end

So, we test to see if the key "calories" is in the hash by using has_key?. If that returns true we move inside the if statement and set a new variable called food to true.

Remember, true is not a string in this case, it is a boolean, so no quotes are needed.

I hope that makes sense!

Steve.

Nithin Rajan
Nithin Rajan
1,737 Points

Hey Steve,

Thanks for the help Steve.

Nithin

Steve Hunter
Steve Hunter
57,712 Points

Glad it worked for you. :-)

Zim Mayfield
Zim Mayfield
2,621 Points
Zim Mayfield
Zim Mayfield
2,621 Points

Thank you, I just forgot the parentheses after my if. you the man!