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rubyruby-hash

Deleting a key-value pair from hash (RUBY)

movies = {
  StarWars: 4.8, 
  Divergent: 4.7
  }

print movies

This code returns a hash:

{:StarWars=>4.8, :Divergent=>4.7}

When I try to delete a key-value pair and print movies again:

movies = {
  StarWars: 4.8, 
  Divergent: 4.7
  }


movies = movies.delete("Divergent".to_sym)
print movies

I get :

4.7

How do I delete a key-value pair, so that after I ask to print the contents of movies hash I get :

{:StarWars=>4.8}
Solution

  • Hash#delete returns the value of provided key, movies.delete("Divergent".to_sym) returns 4.7, and you reassign it to movies, now movies is 4.7.

    So you could just delete and don't reassign:

    movies.delete("Divergent".to_sym)
print movies # => {:StarWars=>4.8}