/Ruby/Difference between Hash.new and Hash.new { |h, k| h[k] = [] }

Difference between Hash.new and Hash.new { |h, k| h[k] = [] }

Difference between Hash.new and Hash.new { |h, k| h[k] = [] }

h = Hash.new { |h, k| h[k] = [] }
h[:a]        # => {:a=>[]}
h[:b] << 123 # => {:a=>[], :b=>[123]}

0

Source: stackoverflow.com

Similar codes

0 vote161 views1 answer
How to add two variables into a hash ruby
Ruby
0 vote177 views1 answer
How to create a database in production mode rails
Ruby
0 vote170 views1 answer
How to differentiate get and post when it has same name in rails
Ruby
0 vote163 views2 answers
Remove first element from an array ruby
Ruby
6 votes294 views1 answer
Ruby array has element
Ruby
0 vote167 views1 answer
Rails keep all params except for some
Ruby
0 vote118 views3 answers
Font awesome in submit tag rails simple form for
Ruby
0 vote168 views1 answer
Devise manually sign out user
Ruby
1 vote171 views1 answer
Ruby measure time
Ruby
3 votes188 views1 answer
Ruby try catch
Ruby

Share