I have seen codebases using Structs to wrap around attributes and behavior inside a class. What is the difference between a Ruby Class and a Struct? And when should one be used
There is quite a big practical performance difference, example behavior in ruby 2.6.3p62:
user system total real
Struct create and access 3.052825 0.005204 3.058029 (3.066316)
Class create and access 0.738605 0.001467 0.740072 (0.743738)
Example code:
require 'benchmark'
REP=1000000
SUser = Struct.new(:name, :age)
DATA = { name: "Harry", age: 75 }
class User
attr_accessor :name, :age
def initialize(name:, age:)
@name = name
@age = age
end
end
Benchmark.bm 20 do |x|
x.report 'Struct create and access' do
REP.times do
user = SUser.new(DATA)
"#{user.name} - #{user.age}"
end
end
x.report 'Class create and access' do
REP.times do
user = User.new(DATA)
"#{user.name} - #{user.age}"
end
end
end