Benchmark: call vs if - MeasureThat.net

Script Preparation code:

var a = true;

Tests:

if check
a = false; if(a === true){ b(); } a = true; if(a === true){ b(); } function b(){ console.log(b); }
empty fn call
a = function(){}; a(); a = function(){ console.log(1); }; a();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
if check
empty fn call

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'd be happy to help you understand the JavaScript benchmark test cases.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run microbenchmarks for various JavaScript scenarios. The benchmarks are designed to measure the performance of different approaches, libraries, and syntax features in JavaScript.

**Script Preparation Code**

The script preparation code is provided as `var a = true;` which initializes a variable `a` with the value `true`. This line is executed only once, before running any test cases. The purpose of this code is to set up the environment for the benchmark tests by initializing a variable that will be used in multiple test cases.

**Html Preparation Code**

The html preparation code is not provided in this example, but it's typically used to prepare the HTML structure and content for the benchmark tests.

**Test Cases**

There are two individual test cases:

1. **"if check"`**
This test case measures the performance of a simple `if` statement. The script definition contains:
```javascript
a = false;
if(a === true){ 
    b();
}
a = true;
if(a === true){
    b(); // This line will not be executed due to the initial value of 'a'
}
function b(){
    console.log(b);
}
```
This test case compares the performance of calling a function `b()` within an `if` statement with the same condition checked outside of it.

2. **"empty fn call"`**
This test case measures the performance of calling an empty function. The script definition contains:
```javascript
a = function(){};
a();
a = function(){
    console.log(1);
};
a();
```
This test case compares the performance of calling an initially empty function and then assigning a new value to it.

**Libraries**

There is no explicit mention of any libraries used in these benchmark tests. However, some JavaScript engines may require specific libraries or features to be enabled for accurate results.

**Special JS Features/Syntax**

The `b` function in both test cases uses the variable capture behavior in JavaScript, which can lead to unexpected results if not handled carefully. In the "if check" test case, the variable `a` is reassigned with a new value before reassigning it again, causing the inner `if` statement to always fail and skip executing the function call. The empty function call test case does not exhibit this behavior.

**Alternatives**

Some alternatives for running JavaScript benchmarks include:

* Google Benchmark: A high-performance benchmarking library for JavaScript.
* jsperf (now obsolete): A popular benchmarking tool that was replaced by MeasureThat.net.
* Node.js benchmarking tools, such as `time` and `benchmark`.
* Micro- benchmarking libraries like `micro-benchmark` and `fast-micro-benchmark`.

Keep in mind that each library has its own strengths and weaknesses, and the choice of which one to use depends on the specific requirements of your project.

Latest run results:

Run details: (Test run date: 3 months ago)

User agent: Mozilla/5.0 (Windows NT 5.1; rv:52.0) Gecko/20100101 Firefox/52.0

Browser/OS: Firefox 52 on Windows XP

View result in a separate tab

Test name	Executions per second
if check	14268.5 Ops/sec
empty fn call	14719.4 Ops/sec

Related benchmarks:

call vs if (version: 0)

Comparing performance of: if check vs empty fn call

Created: 3 months ago by: Guest

Jump to the latest result

if check

empty fn call

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):