Benchmark: i++, ++i, i+=1 - MeasureThat.net

Script Preparation code:

var i=100;

Tests:

i++
i++
i--
i--
++i
++i
i=i+1
i=i+1
i+=1
i+=1;
i=i-1
i=i-1

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
i++
i--
++i
i=i+1
i+=1
i=i-1

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_0_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.0.1 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 18 on iOS 18.0.1

View result in a separate tab

i++

449.3M/s

++i

346.6M/s

i=i+1

178.2M/s

i--

176.4M/s

i=i-1

176.0M/s

i+=1

175.1M/s

View exact numbers

Test name	Executions per second
✓ i++	449,274,592 Ops/sec
++i	346,580,416 Ops/sec
i=i+1	178,198,928 Ops/sec
i--	176,440,304 Ops/sec
i=i-1	175,992,336 Ops/sec
i+=1	175,071,920 Ops/sec

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 definition and test cases.

**Benchmark Definition**

The benchmark is defined as follows:

* The `Script Preparation Code` sets up a variable `i` to 100, which will be used in the subsequent operations.
* The `Html Preparation Code` is empty, indicating that no HTML-related code needs to be executed before running the benchmarks.
* The `Name` and `Description` fields are empty, providing no additional context for the benchmark.

**Options Compared**

The benchmark compares six different operators:

1. **Post-Increment (`i++`)**: Increments the value of `i` by 1 after reading its current value.
2. **Pre-Increment (`++i`)**: Increments the value of `i` before using it, effectively skipping the current value and going straight to the next value in the sequence.
3. **Post-Decrement (`i--`)**: Decrements the value of `i` by 1 after reading its current value.
4. **Pre-Decrement (`--i`)**: Decrements the value of `i` before using it, effectively skipping the current value and going straight to the next value in the sequence.
5. **Assignment (`i = i + 1`)**: Assigns the result of adding 1 to `i` back to `i`.
6. **Assignment with increment (`i += 1`)**: Increments `i` by 1 and assigns the new value back to `i`.

**Pros and Cons**

Here's a brief summary of the pros and cons for each operator:

* **Post-Increment (`i++`)**:
	+ Pros: Simple, intuitive, and easy to understand.
	+ Cons: May lead to unexpected behavior if not carefully considered.
* **Pre-Increment (`++i`)**:
	+ Pros: Efficient in certain situations (e.g., when incrementing a counter).
	+ Cons: May cause issues with code readability and maintainability due to its non-obvious behavior.
* **Post-Decrement (`i--`)**:
	+ Pros: Similar to post-increment, but for decrementing values.
	+ Cons: Same as post-increment; consider the implications carefully.
* **Pre-Decrement (`--i`)**:
	+ Pros: Efficient in certain situations (e.g., when decrementing a counter).
	+ Cons: May cause issues with code readability and maintainability due to its non-obvious behavior.
* **Assignment (`i = i + 1`)**:
	+ Pros: Clear, explicit, and easy to understand.
	+ Cons: May be slower than increment/decrement operators for large values.
* **Assignment with Increment (`i += 1`)**:
	+ Pros: Similar to assignment; clear and easy to understand.
	+ Cons: Slower than direct increment/decrement operations.

**Libraries and Special Features**

None of the test cases use any libraries or special JavaScript features. The benchmarks are straightforward and focus on testing the behavior of basic operators.

No additional explanations are required, as the operators in question do not involve any advanced or specialized concepts.

i++, ++i, i+=1 (version: 2)

Comparing performance of: `i++ vs i-- vs ++i vs i=i+1 vs i+=1 vs i=i-1`

Created: 5 years ago by: Registered User

Go to the latest result

i++

i--

++i

i=i+1

i+=1

i=i-1

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

i++, ++i, i+=1 (version: 2)

Comparing performance of: i++ vs i-- vs ++i vs i=i+1 vs i+=1 vs i=i-1

Created: 5 years ago by: Registered User

Go to the latest result

i++

i--

++i

i=i+1

i+=1

i=i-1

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Comparing performance of: `i++ vs i-- vs ++i vs i=i+1 vs i+=1 vs i=i-1`