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indexOf vs regex vs RegExp regexp fork
(version: 0)
Comparing performance of:
lowercase, trim, indexof vs trim, lowercase, indexof vs regex vs lowercase, replace, indexof vs RegExp
Created:
3 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var str = "This is a simple test!"; var needle = "simple"; var ri = new RegExp('simple', 'i');
Tests:
lowercase, trim, indexof
var a = str.toLowerCase().trim(); var b = needle.toLowerCase().trim(); var c = a.indexOf(b) > -1;
trim, lowercase, indexof
var a = str.trim().toLowerCase(); var b = needle.trim().toLowerCase(); var c = a.indexOf(b) > -1;
regex
var c = ri.test(str);
lowercase, replace, indexof
var a = str.toLowerCase().replace(" ", ""); var b = needle.toLowerCase().replace(" ", ""); var c = a.indexOf(b) > -1;
RegExp
var c = (new RegExp(needle, 'i')).test(str);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (5)
Previous results
Fork
Test case name
Result
lowercase, trim, indexof
trim, lowercase, indexof
regex
lowercase, replace, indexof
RegExp
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark definition and test cases to understand what is being tested. **Benchmark Definition** The benchmark defines four different approaches to search for a substring in a string: 1. `indexOf` method 2. Regular Expression (Regex) with the `/i` flag for case-insensitivity 3. RegExp object with the `test()` method 4. A modified version of the `replace()` method, which is not typically used for searching substrings. **Options Compared** The benchmark compares the performance of these four approaches in terms of: * Speed: The number of executions per second (ExecutionsPerSecond) * Consistency: The consistency of results across different browser versions and platforms **Pros and Cons** 1. `indexOf` method: * Pros: Fast, widely supported, and efficient. * Cons: May not be suitable for case-insensitive searches or when the string is modified during the search process. 2. Regular Expression (Regex) with the `/i` flag: * Pros: Powerful for regular expression matching, can handle complex patterns, and provides a way to match case insensitively. * Cons: Can be slower than other methods due to the overhead of compiling and executing regex patterns. 3. RegExp object with the `test()` method: * Pros: More efficient than using a regex pattern with the `/i` flag, as it avoids the compilation step. * Cons: Less powerful than the full regex engine, may not support all features, and can be slower for complex patterns. 4. Modified version of the `replace()` method: * Pros: Not typically used for searching substrings, so its performance might not be relevant in this context. * Cons: Not suitable for this benchmarking purpose. **Library and Purpose** In one of the test cases, a library is used: * In the "Regex" test case, the `RegExp` constructor is used to create a regex pattern. The `RegExp` object provides a way to define regular expression patterns and execute them on strings. * In the "RegExp" test case, a new `RegExp` object is created with a specific pattern and flags. **Special JS Feature or Syntax** None of the benchmark tests use special JavaScript features or syntax beyond what's standard in JavaScript. The use of regex patterns is simply for string matching. **Other Alternatives** If the focus were to compare other approaches, some alternatives could be: * Using `String.prototype.includes()` method instead of `indexOf()` * Implementing a custom search algorithm using bitwise operations * Comparing performance with other search algorithms like binary search or interpolation search * Evaluating the impact of different string normalization techniques (e.g., trimming, lowercasing) on search performance Keep in mind that these alternatives would require additional test cases and considerations to ensure a fair comparison. Overall, this benchmark provides insight into the relative performance of four common approaches for searching substrings in JavaScript strings.
Related benchmarks:
RegEx.test vs. String.includes vs. String.indexOf
includes + toLowerCase vs RegExp + i
indexOf vs regex vs RegExp regexp fork 3
Matching regex with i flag vs lowercasing the string
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