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split substring replace
(version: 0)
Compares slice, substr and substring to each other when there is only a start index
Comparing performance of:
substring and indexof vs split vs replace
Created:
5 years ago
by:
Guest
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Script Preparation code:
var example = new Date().toISOString();
Tests:
substring and indexof
var result = `${example.substring(0, example.indexOf('.'))}Z`
split
var result = example.split('.')[0] + 'Z'
replace
var result = example.replace(/\.\d{3}Z$/, 'Z')
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
substring and indexof
split
replace
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark and explain what's being tested, compared, and some pros/cons of each approach. **Benchmark Definition** The benchmark is designed to compare three JavaScript methods: `slice`, `substr`, and `substring`. The tests aim to find out which method is the fastest for a specific use case: extracting a substring from a date string using the `.` character as the separator. **Options Compared** There are three options being compared: 1. `slice`: Returns a new string created by copying sections of an existing string. 2. `substr`: Returns a specified length number of characters from the end of a string. 3. `substring`: Returns a specified start and end index of a substring from an existing string. **Pros/Cons of Each Approach** * `slice`: + Pros: Fast, as it uses a native array method. + Cons: May not be optimized for strings, as it returns an array-like object. * `substr`: + Pros: Simple and straightforward, with a clear purpose. + Cons: May not be the most efficient, especially when dealing with large strings. * `substring`: + Pros: Can handle more complex substring extraction scenarios. + Cons: May be slower due to the overhead of parsing the index values. **Library and Purpose** None are mentioned in the provided benchmark definition. However, it's worth noting that some JavaScript engines may have built-in optimizations or implementations for these methods. **Special JS Feature/Syntax** There is a special case here: `example.indexOf('.')`. This method returns the index of the first occurrence of the specified value (in this case, the `.` character). The benchmark uses this index to extract the substring. Note that `indexOf()` may have different behavior depending on the browser or engine. **Other Alternatives** If none of these methods were available, other alternatives could be: * Using a regular expression (`/\\.\\d{3}Z$/`) to extract the desired substring. * Implementing a custom string manipulation function using bitwise operations (e.g., `charCodeAt()` and `substr`). * Utilizing a library like `lodash` or `underscore`, which provide optimized versions of these methods. Keep in mind that these alternatives may have different performance characteristics and trade-offs compared to the original benchmark.
Related benchmarks:
slice vs substr vs substring (with no end index) 22
slice vs substr vs substring vs replace
Performance Test: substring vs substr vs slice vs split for date
Performance Test: substring vs substr vs slice with StartIndex
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