Benchmark: After vs Before 2

Script Preparation code:

var c= 1000000;

Tests:

After +
c++;
Before +
++c;
+= 1
c += 1;
-= 1
c -= 1;
Before -
--c;
After -
c--;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
After +
Before +
+= 1
-= 1
Before -
After -

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark JSON and test cases to explain what's being tested, compared options, their pros and cons, and other considerations.

**Benchmark Definition**
The `Script Preparation Code` section defines a simple JavaScript variable `c` initialized with 1,000,000. This code is run once before each test case to set up the variable.

**Test Cases**
Each test case measures the performance of incrementing or decrementing the variable `c`. There are four test cases:

1. `After +`: Increments the value of `c` using the postfix increment operator (`++c`).
2. `Before +`: Increments the value of `c` using the prefix increment operator (`++c`).
3. `Before -`: Decrements the value of `c` using the decrement operator (`--c`).
4. `After -`: Decrements the value of `c` using the postfix decrement operator (`c--`).

**Comparison and Performance**

The test cases compare the performance of different incrementation and decrementation operators:

* Postfix increment (`++c`) vs prefix increment (`++c`)
* Postfix decrement (`c--`) vs prefix decrement (`--c`)

In general, prefix operations (e.g., `++c`) are faster than postfix operations (e.g., `c++`). This is because the prefix operator can be evaluated immediately, whereas the postfix operator must wait for the value to be used.

**Pros and Cons**

* Prefix increment (`++c`):
	+ Faster due to immediate evaluation
	+ Can lead to subtle bugs if not careful with variable aliasing or scope issues
* Postfix increment (`c++`):
	+ Easier to read and understand, as the increment is separate from the variable value
	+ May be slower due to delayed evaluation

* Prefix decrement (`--c`):
	+ Faster due to immediate evaluation
	+ Can lead to subtle bugs if not careful with variable aliasing or scope issues
* Postfix decrement (`c--`):
	+ Easier to read and understand, as the decrement is separate from the variable value
	+ May be slower due to delayed evaluation

**Library Usage**
None of the test cases use external libraries.

**Special JS Features**
There are no special JavaScript features or syntax used in these test cases. The focus is on comparing the performance of incrementation and decrementation operators.

**Other Considerations**

* This benchmark focuses on the performance difference between prefix and postfix incrementation and decrementation, which can be important for high-performance applications.
* The use of a simple variable `c` with a large initial value allows for measuring performance differences in a controlled environment.
* The test cases are designed to cover different scenarios, including both incrementing and decrementing operations.

**Alternative Benchmarks**
Other benchmarks that might explore similar topics include:

* Comparing the performance of different arithmetic operators (e.g., `*`, `/`, `%`)
* Measuring the performance impact of variable scope and aliasing on incrementation and decrementation operations
* Investigating the performance differences between different data structures or algorithms for incrementing and decrementing values.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Mobile; LYF/LF-2403N/LYF-LF2403N-001-02-08-300518-i;Android; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5

Browser/OS: Firefox Mobile 48 on Firefox OS

View result in a separate tab

Test name	Executions per second
After +	19376002.0 Ops/sec
Before +	19576262.0 Ops/sec
+= 1	1102412.2 Ops/sec
-= 1	1092550.0 Ops/sec
Before -	19587684.0 Ops/sec
After -	19866206.0 Ops/sec

Related benchmarks:

After vs Before 2 (version: 0)

Comparing performance of: After + vs Before + vs += 1 vs -= 1 vs Before - vs After -

Created: 5 years ago by: Guest

Jump to the latest result

After +

Before +

+= 1

-= 1

Before -

After -

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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