perf/benchmark_helper.rb
Use unary plus to get an unfrozen string literal. Open
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.each_with_object(''.dup)- Read upRead up
- Exclude checks
In Ruby 2.3 or later, use unary plus operator to unfreeze a string
literal instead of String#dup and String.new.
Unary plus operator is faster than String#dup.
Note: String.new (without operator) is not exactly the same as +''.
These differ in encoding. String.new.encoding is always ASCII-8BIT.
However, (+'').encoding is the same as script encoding(e.g. UTF-8).
So, if you expect ASCII-8BIT encoding, disable this cop.
Example:
# bad
''.dup
"something".dup
String.new
String.new('')
String.new('something')
# good
+'something'
+''