Benchmark: replace vs slice 2024

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>

Previous results

Test case name	Result
replace
slice

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 OPR/116.0.0.0 (Edition Yx 05)

Browser/OS: Opera 116 on Windows

View result in a separate tab

Test name	Executions per second
replace	330872.2 Ops/sec
slice	321020.4 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

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.

Related benchmarks:

replace vs slice 2024 (version: 0)

Comparing performance of: replace vs slice

Created: one year ago by: Guest

Jump to the latest result

replace

slice

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):