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

Latest run results:

Run details: (Test run date: one year 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

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

Related benchmarks:

call vs if (version: 0)

Comparing performance of: if check vs empty fn call

Created: one year ago by: Guest

Jump to the latest result

if check

empty fn call

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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