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replace vs. slice
(version: 0)
Cut first char from string.
Comparing performance of:
replace vs slice
Created:
3 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var strIn = '#hash'; var strOut = '';
Tests:
replace
strOut = strIn.replace('#', '');
slice
strOut = strIn.slice(1);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
replace
slice
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
6 months ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0
Browser/OS:
Firefox 140 on Linux
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<iframe src="https://measurethat.net/Embed?id=624769" width="100%" height="500px"></iframe>
slice
38.6M/s
replace
13.0M/s
View exact numbers
Test name
Executions per second
✓
slice
38,558,308 Ops/sec
replace
12,986,924 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON data and explain what's being tested, compared, and their pros and cons. **Benchmark Definition** The benchmark is designed to compare two approaches for removing the first character from a string: using the `replace()` method versus the `slice()` method. The input string is defined in the "Script Preparation Code" section as `"var strIn = '#hash';\r\nvar strOut = '';\r\n\r\n\r\n"`. **Options Compared** Two options are compared: 1. **`strOut = strIn.replace('#', '');`**: This approach uses the `replace()` method to replace the first occurrence of the specified character (`#`) with an empty string. 2. **`strOut = strIn.slice(1);`**: This approach uses the `slice()` method to extract a subset of characters from the original string, starting from the second character (index 1). **Pros and Cons** **Replace() Method** Pros: * Can be more readable and intuitive for some developers. * May be more efficient in certain cases due to the way it works internally. Cons: * Can be slower than the `slice()` method for large strings because of the overhead of searching for the replacement character. * May not work correctly if there are multiple occurrences of the specified character, only replacing the first one. **Slice() Method** Pros: * Generally faster and more efficient than the `replace()` method for large strings. * Can handle any number of characters in the original string without issues. Cons: * May be less readable and more challenging to understand for some developers due to its functional programming nature. * Requires careful handling of indices and bounds checking. **Library** None is explicitly mentioned in the provided data. However, it's essential to note that the `slice()` method has been a part of the JavaScript language since ECMAScript 5 (ES5), which means older browsers might not support it or have limited functionality. **Special JS Feature/Syntax** There are no special features or syntax used in this benchmark that would be unique to modern JavaScript versions or specific browser implementations. The `slice()` method has been around for a long time, and the `replace()` method is widely supported. **Other Alternatives** Some alternative approaches to removing the first character from a string could include: * Using a regular expression with the `exec()` method: `var regex = /#/.exec(strIn); strOut = strIn.substring(regex.index + 1);` * Using the `substring()` method with negative indices: `strOut = strIn.substring(-1);` (this is not recommended due to potential issues with index handling) * Using a library like Lodash or a custom implementation using bitwise operations. Keep in mind that these alternatives might have varying levels of performance, readability, and browser support compared to the original approaches used in this benchmark.
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