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instance_exec vs args in a lambda
require 'bundler/setup'
Bundler.require(:default)
class Serializer
def user_path(id)
"/user/#{id}"
end
end
class User
def id
1
end
end
lambda_test1 = ->(user, serializer) { serializer.user_path(user.id) }
lambda_test2 = ->(user) { user_path(user.id) }
serializer = Serializer.new
user = User.new
Benchmark.ips do |x|
x.config(:time => 10, :warmup => 2)
x.report("arg passing") {
lambda_test1.call(user, serializer)
}
x.report("instance_exec") {
serializer.instance_exec(user, &lambda_test2)
}
x.compare!
end
#Warming up --------------------------------------
# arg passing 193.690k i/100ms
# instance_exec 175.730k i/100ms
#Calculating -------------------------------------
# arg passing 3.194M (± 3.9%) i/s - 31.959M in 10.022354s
# instance_exec 2.627M (± 4.1%) i/s - 26.360M in 10.053750s
#Comparison:
# arg passing: 3194134.1 i/s
# instance_exec: 2626788.6 i/s - 1.22x slower
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