fork download
copy 
  1. Person = Struct.new(:id, :first_name, :last_name)
  2. a = [Person.new(1,'Alice', 'Smith'), 
  3.      Person.new(2, 'Bob', 'Smith'),
  4.      Person.new(3,'Carol', 'Smith')]
  5. p m = a.group_by(&:id)
Success #stdin #stdout 0.01s 6496KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
{1=>[#<struct Person id=1, first_name="Alice", last_name="Smith">], 2=>[#<struct Person id=2, first_name="Bob", last_name="Smith">], 3=>[#<struct Person id=3, first_name="Carol", last_name="Smith">]}
https://ideone.com/6twUvV
language:
Ruby (ruby 2.5.5)
created:
224 days ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!