Benchmark: JWT token Split vs Basic string replace

Script Preparation code:

var str = 'Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c';

Tests:

Replace (SIMPLE)
str.replace("Bearer ", "");
Split and Join
str.split(' ')[1];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Replace (SIMPLE)
Split and Join

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

I'll break down the benchmark explanation for you.

**Benchmark Definition:**
The benchmark measures two different approaches to manipulating a string in JavaScript:

1. **String Replacement:** The first approach, as seen in the "Replace (SIMPLE)" test case, replaces all occurrences of the substring "Bearer" with an empty string.
2. **String Split and Join:** The second approach, as seen in the "Split and Join" test case, splits the input string into substrings using a space character and then takes the second element of the resulting array.

**Options Compared:**
The benchmark compares two different approaches to manipulating strings:

1. **Replace Method:** Replaces all occurrences of a substring with an empty string.
2. **Split Method:** Splits a string into substrings using a specified separator and returns an array of those substrings.

**Pros and Cons:**

* **Replace Method:**
	+ Pros:
		- Can be faster for large strings, as it doesn't create intermediate arrays.
		- More concise code.
	+ Cons:
		- May not work correctly if the replacement is not a simple substitution (e.g., replacing "Bearer" with multiple values).
		- Can cause unexpected behavior if the original string is modified elsewhere in the code.
* **Split Method:**
	+ Pros:
		- More predictable and reliable, as it doesn't rely on internal implementation details of the `replace()` method.
		- Can be more readable for complex substitutions.
	+ Cons:
		- May be slower for large strings due to array creation.
		- Requires more code.

**Library Used:**
None. The benchmark uses only native JavaScript methods, specifically `String.prototype.replace()` and `Array.prototype.slice()`.

**Special JS Features or Syntax:**
There are no special features or syntax used in this benchmark. It's a straightforward comparison of two string manipulation techniques using standard JavaScript methods.

**Other Alternatives:**
If you wanted to use alternative approaches for the same problem, here are some options:

1. **Using `Array.prototype.map()`**: Instead of splitting and joining the array, you could use `map()` to create a new array with the desired substring.
2. **Using regular expressions**: You could use regular expressions to replace the substring, which might be more efficient for large strings.
3. **Using an external library or module**: Depending on your specific requirements, you might consider using an external library like Lodash, which provides additional string manipulation functions.

Keep in mind that these alternatives may change the behavior or performance characteristics of the benchmark results.

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser/OS: Chrome 123 on Linux

View result in a separate tab

Test name	Executions per second
Replace (SIMPLE)	13800172.0 Ops/sec
Split and Join	12558189.0 Ops/sec

Related benchmarks:

JWT token Split vs Basic string replace (version: 0)

Comparing performance of: Replace (SIMPLE) vs Split and Join

Created: 7 months ago by: Registered User

Jump to the latest result

Replace (SIMPLE)

Split and Join

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):