Benchmark: Difference i++ vs ++i

Tests:

i++
for (let i = 0; i < 1000000; i++) {}
++i
for (let i = 0; i < 1000000; ++i) {}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
i++
++i

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36 Edg/116.0.1938.76

Browser/OS: Chrome 116 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
i++	3167.4 Ops/sec
++i	3180.3 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition**

The provided JSON represents a benchmark definition, which defines a test case for comparing two approaches: incrementing `i` (`++i`) versus decrementing `i` (`i--`). The code is a simple for loop that increments or decrements the variable `i` within the range of 0 to 1,000,000.

**Options Compared**

The benchmark compares the performance of two options:

1. **Postfix increment (`++i>`):** This approach increments `i` after its value has been used in the current iteration.
2. **Prefix decrement (`i-->`):** This approach decrements `i` before its value is used in the current iteration.

**Pros and Cons**

Both approaches have their trade-offs:

*   **Postfix increment (`++i>`):**
    *   Pros:
        *   More intuitive for some developers (as it's more common to see code that increments a variable after using it).
        *   May lead to better code readability.
    *   Cons:
        *   Can result in slower performance due to the unnecessary extra operation (incrementing `i`).
*   **Prefix decrement (`i-->`):**
    *   Pros:
        *   Often leads to faster performance since the incrementation is done before using the value, reducing the overhead.
        *   Can lead to better optimization opportunities by compilers and interpreters.
    *   Cons:
        *   May be less intuitive for some developers due to its uncommon usage.

**Library**

There are no libraries explicitly mentioned in the provided JSON. The benchmark uses built-in JavaScript functions and operators (e.g., `++`, `-=`).

**Special JS Features/Syntax**

No special JavaScript features or syntax are mentioned in the provided examples. However, it's worth noting that some browsers may have specific optimization strategies for certain incrementation/decrementation patterns.

**Other Alternatives**

Some alternative approaches you might consider benchmarking on MeasureThat.net include:

*   **Pre-increment (`++i`)**: This approach increments `i` before its value is used in the current iteration. It's similar to postfix increment but might be faster due to reduced overhead.
*   **Pre-decrement (`--i`)**: This approach decrements `i` after its value has been used in the current iteration. Similar to prefix decrement but with some potential performance implications.

These alternative approaches can help you better understand how JavaScript interpreters and compilers optimize incrementation and decrementation patterns, leading to more efficient code and potentially better performance.

Keep in mind that MeasureThat.net provides a flexible platform for comparing different programming concepts and optimizing code, so feel free to experiment and find the best approach for your specific use case.

Related benchmarks:

Difference i++ vs ++i (version: 0)

Comparing performance of: i++ vs ++i

Created: one year ago by: Guest

Jump to the latest result

i++

++i

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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