var str = '124sadf96192586sdf1925asdf69asdf12569qewtq81zxcv25';
var r1 = /\D/g;
var r2 = /\D+/g;
str.replace(r1, '');
str.replace(r2, '');
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
r1 | |
r2 |
Test name | Executions per second |
---|---|
r1 | 1532247.9 Ops/sec |
r2 | 2025161.5 Ops/sec |
I'd be happy to explain what's being tested in the provided JSON benchmark.
Benchmark Definition
The benchmark defines two test cases, "r1" and "r2", which are used to measure the performance of JavaScript regular expressions (regex) in removing non-printable characters (\\D
) from a given string. The script preparation code is a simple example that creates two regex patterns, r1
and r2
, using forward slashes (/
) and capturing all non-printable characters (\\D+
). The HTML preparation code is empty.
Options Compared
The benchmark compares the performance of str.replace(r1, '')
(test case "r1") against str.replace(r2, '')
(test case "r2"). Both tests use the same input string (str
) and measure the number of executions per second.
Pros and Cons of Different Approaches
replace()
: The replace()
method is a built-in JavaScript function that replaces substrings with new values. The pros are that it's easy to use and doesn't require manual regex pattern writing. However, the cons are that it may be slower than using regex patterns directly and can lead to issues if not used carefully.Library: RegExp
The RegExp
object is a built-in JavaScript class that provides support for regular expressions. It's used in this benchmark to create the regex patterns r1
and r2
. The RegExp
object has various methods, such as test()
, exec()
, and replace()
, which can be used to work with regex patterns.
Special JS Feature/Syntax There is no special JavaScript feature or syntax being tested in this benchmark. It's a straightforward test of regular expression performance.
Other Alternatives If you want to write similar benchmarks, you could consider using other JavaScript testing frameworks like Jest or Mocha. Alternatively, you could also use existing benchmarking tools like Benchmark.js or jsperf.
Keep in mind that the choice of approach and library may vary depending on your specific use case and requirements.