| Commit message (Collapse) | Author | Age | Files | Lines |
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In the `tag_options` method, strings are continuously added to the
`output` string. Previously, we concatenated two strings and added the
generated string to `output`. By adding each of the strings to
`output`, one after the other, we will save the allocation of that
concatenated string.
Benchmark:
require 'benchmark/ips'
sep = " ".freeze
Benchmark.ips do |x|
x.report("string +") {
output = ""
output << sep + "foo"
}
x.report("string <<") {
output = ""
output << sep
output << "foo"
}
x.compare!
end
Results (Ruby 2.2.2):
Calculating -------------------------------------
string + 88.086k i/100ms
string << 94.287k i/100ms
-------------------------------------------------
string + 2.407M (± 5.8%) i/s - 12.068M
string << 2.591M (± 7.0%) i/s - 12.917M
Comparison:
string <<: 2591482.4 i/s
string +: 2406883.7 i/s - 1.08x slower
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In the `tag_options` method an array is used to build up elements, then `Array#*` (which is an alias for `Array#join` is called to turn the array into a string. Instead of allocating an array to build a string, we can build the string we want from the beginning.
Saved: 121,743 bytes 893 objects
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When an unknonwn key is passed to the hash in `PRE_CONTENT_STRINGS` it returns nil, when you call "#{nil}" it allocates a new empty string. We can get around this allocation by using a default value `Hash.new { "".freeze }`. We can avoid the `to_sym` call by pre-populating the hash with a symbol key in addition to a string key.
We can freeze some strings when using Array#* to reduce allocations.
Array#join can take frozen strings.
This change buys us 86,600 bytes of memory and 1,857 fewer objects per request.
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HTML doesn't care what order the elements are rendered in, so why should we?
Updates tests to use proper `assert_dom_equal` instead of `assert_equal` /cc @jeremy
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Since 6857415187810f1289068a448268264d0cf0844f we are using #safe_join to
join the content when an Array is given, so we must include the dependent
module here to make sure it's available when this module is used alone.
This was making Simple Form tests to fail with current master due to the
missing dependency.
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In tag helper, honor html_safe on arrays; also make safe_join more similar to Array.join
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similar to Array.join by first calling flatten.
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before this change, we were allocating AS::SafeBuffer objects that were
being interpolated in to a string, so the safe buffer object was being
thrown away. This change only allocates a string (vs a string *and* a
safebuffer) and interpolates the string.
On my test application, this reduced the AS::SafeBuffer objects from
1527k per request to about 500 per request.
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Rails 3.2 API allowed arbitrary input for cdata_section;
this change re-introduces the old behaviour.
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