Benchmark: replace character at the end of the string yes

Script Preparation code:

var tests = [
  "bobl/ajs(lkfjq+wiejrf!aksdjf!kasjerfijqwef==", 
  "lkajsdlf/j!wjjqiaeruopqweijrfkj!kja!skdjf=", 
  "laksjdflkjqoweirjoqiwjefdlaksdjfliqwjefoiasjdfol"
];

Tests:

replace
for (let test of tests){ test.replace(/=+$/, "") }
substring
for (let test of tests){ test.substring(0, test.length - (test[test.length-2] === "=" ? 2 : test[test.length-1] === "=" ? 1 : 0)) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
replace
substring

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its options.

**Benchmark Definition**

The benchmark definition is a JSON object that describes the benchmark to be measured. In this case, there are two test cases:

1. "replace"
2. "substring"

These test cases aim to measure the performance of JavaScript strings operations.

**Options Compared**

In each test case, we have different approaches to achieve the same goal (replacing a character at the end of a string). Here's what's being compared:

* `replace`: Uses the built-in `String.prototype.replace()` method with a regular expression.
* `substring`: Uses a custom implementation using `String.prototype.substring()`, which involves parsing the input string to determine how many characters to remove from the end.

**Pros and Cons of Each Approach**

1. **`replace`**
	* Pros:
		+ Easy to implement and understand.
		+ Built-in method, so it's likely to be optimized by the JavaScript engine.
	* Cons:
		+ May incur a performance penalty due to the overhead of the regular expression engine.
2. **`substring`**
	* Pros:
		+ Can potentially outperform `replace()` if the input string has a specific pattern (e.g., always ends with "=").
	* Cons:
		+ Requires manual parsing of the input string, which can be error-prone and performance-intensive.

**Library Used**

In this benchmark, there is no external library being used. However, some JavaScript engines may have their own built-in optimizations or features that could affect the results.

**Special JS Feature or Syntax**

There doesn't seem to be any special JavaScript feature or syntax being used in this benchmark.

**Alternative Implementations**

If you wanted to implement a custom string replacement algorithm without using the `replace()` method, here are some alternatives:

* Use a simple loop to iterate through the input string and replace characters manually.
* Use a more efficient algorithm like Boyer-Moore or Knuth-Morris-Pratt for regular expression matching.
* Consider using a library or framework that provides optimized string manipulation functions.

Keep in mind that these alternatives might not be as performant as the built-in `replace()` method, especially if you're dealing with complex input strings.

Related benchmarks:

replace character at the end of the string yes (version: 0)

Comparing performance of: replace vs substring

Created: 3 years ago by: Guest

Jump to the latest result

replace

substring

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):