Benchmark: setmptyarray - MeasureThat.net

Script Preparation code:

var array = [1, 2, 3, 4, 5, "1", "2", "3", "4", "5", undefined, null, "test", {},
    [], Infinity
];
var global;

Tests:

=[]
if(true) { eval(""); global = array; global = []; }
=0
if(true) { eval(""); global = array; global.length = 0; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
=[]
=0

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.64 Safari/537.36 Edg/101.0.1210.53

Browser/OS: Chrome 101 on Windows

View result in a separate tab

Test name	Executions per second
=[]	1423107.4 Ops/sec
=0	1337811.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring the performance of JavaScript microbenchmarks can be fascinating, but also complex. Let's break down what's being tested in this specific benchmark and explore the options compared.

**Benchmark Definition:**
The benchmark defines two test cases:

1. `setmptyarray`: This test case creates an array with various types of values (numbers, strings, undefined, null) and assigns it to a global variable.
2. Two test cases are defined for setting the length of the `array` variable to 0:
	* `=0`
	* The test script will create the same array as in the previous step, but this time, it will set the `length` property of the `array` variable to 0.

**Options Compared:**
The benchmark compares two approaches:

1. **Assigning a new value to the `global` variable**: This involves creating a new object reference and assigning the `array` object to a new global variable (`global = array`). This approach might incur additional overhead due to the creation of a new object.
2. **Modifying the existing `length` property**: This involves modifying an existing property of the `array` object, which is likely to be more efficient since it doesn't require creating a new object reference.

**Pros and Cons:**

* Assigning a new value to the `global` variable:
	+ Pros: Might be necessary if the `array` variable needs to be reused elsewhere in the script.
	+ Cons: Can incur additional overhead due to object creation.
* Modifying the existing `length` property:
	+ Pros: Generally more efficient since it doesn't require creating a new object reference.
	+ Cons: Might not work correctly if the `length` property is accessed after the modification, as some JavaScript engines may reify the property (i.e., create a new object with the modified value).

**Library/Functionality Used:**
The benchmark uses the `eval()` function to evaluate strings. The `eval()` function parses the string as JavaScript code and executes it. This can be useful for various purposes, such as executing dynamic or user-inputted code.

**Special JS Feature/Syntax:**
The benchmark doesn't appear to use any special JavaScript features or syntax beyond what's standard in modern JavaScript engines.

**Other Considerations:**

* The benchmark uses a global variable (`global`) to store the `array` object. This can lead to naming conflicts if other parts of the script are using the same name.
* The benchmark creates an array with various types of values, which might not be representative of typical use cases.
* The benchmark doesn't account for potential caching or optimization issues in the JavaScript engine.

**Alternatives:**

If you're interested in exploring alternative benchmarks or testing scenarios, you could consider:

* Using a different JavaScript engine or runtime environment (e.g., Node.js, V8)
* Testing different data structures, such as objects or sets
* Evaluating the performance of various optimization techniques, like memoization or caching
* Creating more realistic test cases that mimic typical use cases

Keep in mind that the specific options and approaches compared will depend on your goals and requirements. If you have any further questions or would like to discuss alternatives, feel free to ask!

Related benchmarks:

setmptyarray (version: 0)

array = [] array.length = 0

Comparing performance of: =[] vs =0

Created: 2 years ago by: Guest

Jump to the latest result

=[]

=0

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):