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replace vs slice 2024
(version: 0)
Benchmark.js
Comparing performance of:
replace vs slice
Created:
2 years ago
by:
Guest
Go to the latest result
Tests:
replace
let txt = "hello", newTxt = txt.replace(txt[0], txt[0].toUpperCase()); console.log(newTxt);
slice
let txt = "hello", newTxt = txt[0].toUpperCase() + txt.slice(1); console.log(newTxt);
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:
7 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=624768" width="100%" height="500px"></iframe>
replace
97K/s
slice
91K/s
View exact numbers
Test name
Executions per second
✓
replace
96,876 Ops/sec
slice
91,337 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, compared, and some of the considerations. **Benchmark Overview** The benchmark is comparing two approaches to modify a string: `replace` and `slice`. The test case uses JavaScript, which is commonly used for web development. **Options Compared** The two options being compared are: 1. **String Replacement using `replace()` method**: This approach replaces a specific character (the first character in the string) with its uppercase version. 2. **String Slicing using `slice()` method**: This approach extracts all characters from the string except for the first one, and then converts the resulting string to uppercase. **Pros and Cons of Each Approach** 1. **`replace()` method**: * Pros: Simple and straightforward; can be used for more complex replacements. * Cons: Can be slower than `slice()` because it creates a new string object each time. 2. **`slice()` method**: * Pros: Can be faster than `replace()` because it doesn't create a new string object. * Cons: May not be as intuitive or readable for simple replacements. **Library/Function Used** In this benchmark, the `toUpperCase()` function is used to convert the extracted substring to uppercase. This function is part of the JavaScript standard library and is available in most browsers and environments. **Special JS Feature/Syntax** There are no specific JavaScript features or syntax mentioned in the benchmark that require special consideration. The focus is on comparing two basic string manipulation approaches. **Other Considerations** * The benchmark uses a simple string input ("hello") to demonstrate the comparison. * The test cases do not account for edge cases, such as an empty input string or a string with multiple occurrences of the character to be replaced. * The benchmark assumes that the input string is ASCII; if the input string can contain non-ASCII characters, the behavior may differ. **Alternatives** Other approaches to modify strings in JavaScript include: 1. **Using a regular expression**: You can use a regular expression to replace or extract specific patterns from a string. 2. **Using a library like Lodash**: Lodash provides utility functions for string manipulation, including `replace()` and `slice()`. 3. **Using a different programming language**: If performance is critical, you may consider using a language that provides more efficient string manipulation capabilities, such as C++ or Rust. Keep in mind that the choice of approach depends on your specific use case and requirements.
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