| Commit message (Collapse) | Author | Age | Files | Lines |
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I frequently find myself having to .compact but for blank. which means
on an array reject(&:blank?) (this is fine), or,
on a hash `.reject { |_k, v| v.blank? }` which is slightly more
frustrating and i usually write it as .reject(&:blank?) first and am
confused when it's trying to check if the keys are blank.
I've added the analagous .compact_blank! where there's a reject! to
build on (there's also a reject! in Set, but there's no other core_ext
touching Set so i've left that alone)
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Enumerable#excluding
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internal API [ci skip]
`:nodoc:` is specified, but unfortunately, it is exposed in the API doc.
http://edgeapi.rubyonrails.org/classes/Enumerable.html#method-i-_original_sum_with_required_identity
If the method of the `alias` destination is public, the specification of
`:nodoc:` does not seem to work.
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In the app I'm working on I've wished that index_by had a buddy that would
assign the hash value instead of the key multiple times.
Enter index_with. Useful when building a hash from a static list of
symbols. Before you'd do:
```ruby
POST_ATTRIBUTES.map { |attr_name| [ attr_name, public_send(attr_name) ] }.to_h
```
But now that's a little clearer and faster with:
````ruby
POST_ATTRIBUTES.index_with { |attr_name| public_send(attr_name) }
```
It's also useful when you have an enumerable that should be converted to a hash,
but you don't want to muddle the code up with the overhead that it takes to create
that hash. So before, that's:
```ruby
WEEKDAYS.each_with_object(Hash.new) do |day, intervals|
intervals[day] = [ Interval.all_day ]
end
```
And now it's just:
```ruby
WEEKDAYS.index_with([ Interval.all_day ])
```
It's also nice to quickly get a hash with either nil, [], or {} as the value.
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It's not public API so don't document it.
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Since #32034, Rails 6 requires Ruby 2.4.1+.
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This reverts commit 3420a14590c0e6915d8b6c242887f74adb4120f9, reversing
changes made to afb66a5a598ce4ac74ad84b125a5abf046dcf5aa.
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[ci skip]
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If we require 'active_support/core_ext/enumerable' on Ruby 2.4,
we'll see following warning because `Enumerable#sum` and `Array#sum`
are added in Ruby 2.4.
```
rails/rails/activesupport/lib/active_support/core_ext/enumerable.rb:20: warning: method redefined; discarding old sum
```
The minimal way to fix the warning is `alias sum sum`.
```
$ ruby -v
ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-linux]
$ ruby -w -e "def a; end; def a; end"
-e:1: warning: method redefined; discarding old a
-e:1: warning: previous definition of a was here
$ ruby -w -e "def a; end; alias a a; def a; end"
```
But this behavior is not intended. (@amatsuda was told by @ko1)
So we should use `alias` as a meaningful way.
Ruby 2.4's `sum` (`orig_sum`) assumes an `identity` is `0` when we omit `identity`
so we can delegate to `orig_sum` with explicit `identity` only.
In a strict sense, we can detect `identity` by check instance's class
but we don't care at this time about that because calling `Enumerable#sum` is rare.
In many cases, we will call `Array#sum`.
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Because we don't want to see our ugly orig_sum method outside of this file
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Calculating -------------------------------------
before 34.731k i/100ms
after 48.206k i/100ms
-------------------------------------------------
before 508.451k (± 1.2%) i/s - 2.570M
after 720.068k (± 0.9%) i/s - 3.615M
Comparison:
after: 720067.6 i/s
before: 508451.1 i/s - 1.42x slower
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Use original `Array#sum` when calculating Numeric sum.
This commit is related #24804 issue.
Issue #24804 reports `Array#sum` becomes much slower when
ActiveSupport is included.
This commit tries to use original method as far as possible.
```shell
$ cat array_sum.rb
class Array
alias core_sum sum
end
require 'benchmark/ips'
require 'active_support/core_ext/enumerable'
ary = [1.0] * 1_000_000
Benchmark.ips do |x|
x.report("core sum") { ary.core_sum }
x.report("AS's sum") { ary.sum }
x.compare!
end
$ bundle exec ruby -v -I lib array_sum.rb
ruby 2.4.0dev (2016-05-01 master 54867) [x86_64-darwin14]
Calculating -------------------------------------
core sum 4.000 i/100ms
AS's sum 5.000 i/100ms
-------------------------------------------------
core sum 50.492 (± 7.9%) i/s - 252.000
AS's sum 50.116 (± 6.0%) i/s - 250.000
Comparison:
core sum: 50.5 i/s
AS's sum: 50.1 i/s - 1.01x slower
```
Signed-off-by: Jeremy Daer <jeremydaer@gmail.com>
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Signed-off-by: Jeremy Daer <jeremydaer@gmail.com>
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To suppress warning ('warning: method redefined; discarding old sum')
remove the method before override it.
Signed-off-by: Jeremy Daer <jeremydaer@gmail.com>
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Ruby 2.4 introduces `Array#sum`, but it only supports numeric elements,
breaking our `Enumerable#sum` which supports arbitrary `Object#+`.
To fix, override `Array#sum` with our compatible implementation.
Native Ruby 2.4:
%w[ a b ].sum
# => TypeError: String can't be coerced into Fixnum
With `Enumerable#sum` shim:
%w[ a b ].sum
# => 'ab'
We tried shimming the fast path and falling back to the compatible path
if it fails, but that ends up slower even in simple causes due to the cost
of exception handling. Our only choice is to override the native `Array#sum`
with our `Enumerable#sum`.
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Not only does this make for simpler, more obvious code, it's also more performant:
require 'benchmark/ips'
module Enumerable
def old_sum(identity = 0, &block)
if block_given?
map(&block).old_sum(identity)
else
inject { |sum, element| sum + element } || identity
end
end
def new_sum(identity = 0, &block)
if block_given?
map(&block).new_sum(identity)
else
inject(:+) || identity
end
end
end
summable = (1..100).to_a # sum is 5050
Benchmark.ips do |x|
x.report("old_sum") { summable.old_sum }
x.report("new_sum") { summable.new_sum }
x.compare!
end
# Calculating -------------------------------------
# old_sum 10.674k i/100ms
# new_sum 14.542k i/100ms
# -------------------------------------------------
# old_sum 117.350k (± 7.1%) i/s - 587.070k
# new_sum 154.712k (± 3.8%) i/s - 785.268k
#
# Comparison:
# new_sum: 154712.1 i/s
# old_sum: 117350.0 i/s - 1.32x slower
More benchmarks [here](https://gist.github.com/tjschuck/b3fe4e8c812712376648), including summing strings and passing blocks. The performance gains are less for those, but this version still always wins.
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This allows easier integration with ActiveRecord, such that
AR#pluck will now use Enumerable#pluck if the relation is loaded,
without needing to hit the database.
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Allows fetching the same values from arrays as from ActiveRecord associations.
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[egilburg]
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At 1bd4d1c67459a91415ee73a8f55d2309c0d62a87 was added Range#sum
optimized version for arithmetic progressions. This improvment injected
a defect with not integer range boundaries. The defect was fixed by
e0adfa82c05f9c975005f102b4bcaebfcd17d241. The second commit really
disabled optimization at all because in Ruby integer-valued numbers are
instances of Fixnum and Bignum classes. We should #use is_a?
(#kind_of?) method instead #instance_of? to check if value is numerical:
1.class # => Fixnum
1.instance_of?(Integer) # => false
1.is_a?(Integer) # => true
-100_000_000_000.class # => Bignum
-100_000_000_000.instance_of?(Integer) # => false
-100_000_000_000.is_a?(Integer) # => true
Moreover original implementation of Range#sum has a defect with reverse
range boundaries. If the first boundary is less than the second range is
empty. Current commit fixes and tests this case too.
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it come back occasionally in 367741ef
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collect(&:method) *DHH*"
This reverts commit 4d20de8a50d889a09e6f5642984775fe796ca943.
Conflicts:
activesupport/CHANGELOG.md
activesupport/lib/active_support/core_ext/enumerable.rb
activesupport/test/core_ext/enumerable_test.rb
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There are a bunch of other implicit branches that adds
1.8.x specific code that still needs to be removed. Pull
requests for those cases are welcome.
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readability for non-native english speakers.
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's/[ \t]*$//' -i {} \;)
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