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is passed:
```ruby
class FooNew
def try(method_name = nil, *args)
nil
end
end
class FooOld
def try(*args)
nil
end
end
require 'benchmark/ips'
foo_new = FooNew.new
foo_old = FooOld.new
Benchmark.ips do |x|
x.report("new") { foo_new.try(:anything) }
x.report("old") { foo_old.try(:anything) }
x.compare!
end
# Warming up --------------------------------------
# new 250.633k i/100ms
# old 232.322k i/100ms
# Calculating -------------------------------------
# new 6.476M (± 4.8%) i/s - 32.332M in 5.005777s
# old 5.258M (± 3.2%) i/s - 26.485M in 5.042589s
# Comparison:
# new: 6476002.5 i/s
# old: 5257912.5 i/s - 1.23x slower
```
It's worth noting that checking for nil separately as in https://github.com/rails/rails/pull/34067 seems to be MUCH faster. It might be worth it to apply a blanket `&.` to every internal `try` call.
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Following up on #33747, this takes things a step further by pulling out
the method name from the arguments array, letting us skip an allocation
in the case where there are no arguments -- notably, this also no longer
*requires* the splat to be an array, allowing us to benefit from
optimizations in Jruby (and maybe MRI in the future) of skipping the
array allocation entirely.
Benchmark results:
```
Warming up --------------------------------------
old 179.987k i/100ms
new 199.201k i/100ms
Calculating -------------------------------------
old 3.029M (± 1.6%) i/s - 15.299M in 5.052417s
new 3.657M (± 1.2%) i/s - 18.326M in 5.012648s
Comparison:
new: 3656620.7 i/s
old: 3028848.3 i/s - 1.21x slower
```
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Here’s the micro benchmark:
```ruby
module ActiveSupport
module NewTryable #:nodoc:
def try(*a, &b)
return unless a.empty? || respond_to?(a.first)
return public_send(*a, &b) unless a.empty?
return nil unless block_given?
return instance_eval(&b) if b.arity == 0
yield self
end
def try!(*a, &b)
return public_send(*a, &b) if !a.empty?
return nil unless block_given?
return instance_eval(&b) if b.arity == 0
yield self
end
end
end
module ActiveSupport
module OldTryable #:nodoc:
def try(*a, &b)
try!(*a, &b) if a.empty? || respond_to?(a.first)
end
def try!(*a, &b)
if a.empty? && block_given?
if b.arity == 0
instance_eval(&b)
else
yield self
end
else
public_send(*a, &b)
end
end
end
end
class FooNew
include ActiveSupport::NewTryable
def foo
end
end
class FooOld
include ActiveSupport::OldTryable
def foo
end
end
foo_new = FooNew.new
foo_old = FooOld.new
require 'benchmark/ips'
Benchmark.ips do |x|
x.report("old") { foo_old.try(:foo) }
x.report("new") { foo_new.try(:foo) }
x.compare!
end
# Warming up --------------------------------------
# old 144.178k i/100ms
# new 172.371k i/100ms
# Calculating -------------------------------------
# old 2.181M (± 8.0%) i/s - 10.813M in 5.001419s
# new 2.889M (± 7.7%) i/s - 14.479M in 5.051760s
# Comparison:
# new: 2888691.7 i/s
# old: 2180740.7 i/s - 1.32x slower
```
Also reduces memory. On https://www.codetriage.com i’m seeing 1.5% fewer object allocations per request (in object count).
Before:
Total allocated: 1014475 bytes (8525 objects)
After:
Total allocated: 1015499 bytes (8389 objects)
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This reverts commit 3420a14590c0e6915d8b6c242887f74adb4120f9, reversing
changes made to afb66a5a598ce4ac74ad84b125a5abf046dcf5aa.
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The current code base is not uniform. After some discussion,
we have chosen to go with double quotes by default.
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Ruby 2.4 unifies Fixnum and Bignum into Integer: https://bugs.ruby-lang.org/issues/12005
* Forward compat with new unified Integer class in Ruby 2.4+.
* Backward compat with separate Fixnum/Bignum in Ruby 2.2 & 2.3.
* Drops needless Fixnum distinction in docs, preferring Integer.
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The perf gain is relatively minor but consistent:
```
Calculating -------------------------------------
0.zero? 137.091k i/100ms
1.zero? 137.350k i/100ms
0 == 0 142.207k i/100ms
1 == 0 144.724k i/100ms
-------------------------------------------------
0.zero? 8.893M (± 6.5%) i/s - 44.280M
1.zero? 8.751M (± 6.4%) i/s - 43.677M
0 == 0 10.033M (± 7.0%) i/s - 49.915M
1 == 0 9.814M (± 8.0%) i/s - 48.772M
```
And try! is quite a big hotspot for us so every little gain is appreciable.
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* Rename `ActiveSupport::Try` => `ActiveSupport::Tryable`
* Include the modules inline
* `private` indentation
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`Delegator` inherits from `BasicObject`, which means that it will not
have `Object#try` defined. It will then delegate the call to the
underlying object, which will not (necessarily) respond to the method
defined in the enclosing `Delegator`.
This patches `Delegator` with the `#try` method to work around the
surprising behaviour.
Fixes #5790
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Also add doc examples for `Object.nil`.
[ci skip]
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@rafaelfranca suggested in f7c7bcd9 that code examples should display
the result after `# =>` and not after `#=>`.
This commit replaces *all* the occurrences of `#=>` in the code documentation
(mostly added by me :sob:) with the suggested `# =>`.
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@carlosantoniodasilva pointed out that when `@person` is nil then this would blow up when you ended up calling `#first`on `nil`.
> "there’s no way to break a try chain when you enter it :D"
[ci skip]
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- better `if` example
- Added chaining example to the try method description
- Documented the `respond_to?` check to the try method description
- Clearer wording to explain that argument error is raised on argument mismatch to responding method, rather than to non-responding method (which is handled without exception by `try`)
- `.any?` is more precise than `! .blank?`
- Don't need to use `try` on `children` as (for regular associations) they will always be a collection or array that responds to `first`
- Fix typos/grammar
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Based on commit 5e51bdda.
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just needed some tenderloving instance_eval to fit the bill
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This reverts commit 70d6e16fbad75b89dd1798ed697e7732b8606fa3, reversing
changes made to ea4db3bc078fb3093ecdddffdf4f2f4ff3e1e8f9.
Seems to be a code merge done by mistake.
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Removed in 0228a73b1094a3e19ad291d2ce4789890c09578a, pull request #7310.
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object does not implement the method
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[ci skip] closes #5790
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This reverts commit 29a5aeaae976bf8432d57ec996c7c81932a39de6.
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be called. Kind of like a tap_if_present.
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http://rdoc.rubyforge.org/RDoc/Parser/Ruby.html
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