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claudiob/replace-slower-block-call-with-faster-yield
Replace (slower) block.call with (faster) yield
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This reverts commit 0ab075e75f58bf403f7ebe20546c7005f35db1f6.
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Performance optimization: `yield` with an implicit `block` is faster than `block.call`.
See http://youtu.be/fGFM_UrSp70?t=10m35s and the following benchmark:
```ruby
require 'benchmark/ips'
def fast
yield
end
def slow(&block)
block.call
end
Benchmark.ips do |x|
x.report('fast') { fast{} }
x.report('slow') { slow{} }
end
# => fast 154095 i/100ms
# => slow 71454 i/100ms
# =>
# => fast 7511067.8 (±5.0%) i/s - 37445085 in 4.999660s
# => slow 1227576.9 (±6.8%) i/s - 6145044 in 5.028356s
```
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to zero, so we only travel with per-second precision, not anything deeper than that.
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Rails applications are expected to be always aware of the application
time zone.
To be consistent with that contract, we have to assume that a bare
date passed to time helpers is a date in the application time zone,
not in the system time zone. The system time zone is irrelevant, we
should totally ignore it.
For example,
travel_to user.birth_date + 40.years
should make that user be 40th years old regardless of the system
time zone. Without this patch that may not be true.
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This behavior is only work out-of-box with minitest and also add a
downside to run after each test case, even if we don't used the travel
or travel_to methods
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Add `ActiveSupport::Testing::TimeHelpers#travel` and `#travel_to`. These
methods change current time to the given time or time difference by
stubbing `Time.now` and `Date.today` to return the time or date after
the difference calculation, or the time or date that got passed into the
method respectively. These methods also accept a block, which will
return current time back to its original state at the end of the block.
Example for `#travel`:
Time.now # => 2013-11-09 15:34:49 -05:00
travel 1.day
Time.now # => 2013-11-10 15:34:49 -05:00
Date.today # => Sun, 10 Nov 2013
Example for `#travel_to`:
Time.now # => 2013-11-09 15:34:49 -05:00
travel_to Time.new(2004, 11, 24, 01, 04, 44)
Time.now # => 2004-11-24 01:04:44 -05:00
Date.today # => Wed, 24 Nov 2004
Both of these methods also accept a block, which will return the current
time back to its original state at the end of the block:
Time.now # => 2013-11-09 15:34:49 -05:00
travel 1.day do
User.create.created_at # => Sun, 10 Nov 2013 15:34:49 EST -05:00
end
travel_to Time.new(2004, 11, 24, 01, 04, 44) do
User.create.created_at # => Wed, 24 Nov 2004 01:04:44 EST -05:00
end
Time.now # => 2013-11-09 15:34:49 -05:00
This module is included in `ActiveSupport::TestCase` automatically.
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