How can I an add array of values to a key programatically?

Question

I am new in Ruby and I wanna add a block of hash to the top of the programmer_hash:

def adding_matz
    programmer_hash = 
    {
    :grace_hopper => {
      :known_for => "COBOL",
      :languages => ["COBOL", "FORTRAN"]
    },
    :alan_kay => {
      :known_for => "Object Orientation",
      :languages => ["Smalltalk", "LISP"]
    },
    :dennis_ritchie => {
      :known_for => "Unix",
      :languages => ["C"]
    }
 }
end

This is what I want to add to the top of programmer_hash hash:

:yukihiro_matsumoto => {
    :known_for => "Ruby",
     :languages => ["LISP", "C"]
}

I have added the code below at the end of the method:

programmer_hash[:yukihiro_matsumoto] = [:known_for['Ruby']]
programmer_hash[:yukihiro_matsumoto][:languages] = 'LISP'
programmer_hash[:yukihiro_matsumoto][:languages] = 'C'

It worked pretty well, but I want to do all of this in one line, but nothing comes out right. I will appreciate your help.

"I have added the code below [...] It worked pretty well" – I doubt so. :known_for['Ruby'] returns nil, so the first line would assign [nil] to the key :yukihiro_matsumoto. The second line would then result in an error. — Stefan
– Stefan, Commented Aug 20, 2019 at 8:01

mrzasa · Accepted Answer · 2019-08-20 08:00:17Z

2

Assign a new hash to :yukihiro_matsumoto key in the main hash:

programmer_hash[:yukihiro_matsumoto] = { 
  known_for: 'Ruby'
  languages: ['LISP', 'C']
}

edited Aug 20, 2019 at 8:00

answered Aug 20, 2019 at 7:15

mrzasa

23.4k11 gold badges60 silver badges96 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Sudipta Mondal · Accepted Answer · 2019-08-20 07:22:55Z

1

You can merge two hashes. Standard docs for merge!

programmer_hash = {
    :grace_hopper => {
        :known_for => "COBOL",
        :languages => ["COBOL", "FORTRAN"]
     },
    :alan_kay => {
        :known_for => "Object Orientation",
        :languages => ["Smalltalk", "LISP"]
     },
    :dennis_ritchie => {
        :known_for => "Unix",
        :languages => ["C"]
    }
}

Then you have your another hash like below

another_hash = { 
    :yukihiro_matsumoto => {
        :known_for => "Ruby",
         :languages => ["LISP", "C"]
    }
}

Then you can merge them by -

programmer_hash.merge!(another_hash)

answered Aug 20, 2019 at 7:22

Sudipta Mondal

2,5721 gold badge20 silver badges21 bronze badges

Collectives™ on Stack Overflow

How can I an add array of values to a key programatically?

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related