Benchmark: Check is string or object with property

Script Preparation code:

var xxx = {test: 1};
var yyy = "TEST";

Tests:

Property test Object
if(xxx?.test){ }
String test Object
if(typeof xxx === 'string'){ }
Property test String
if(yyy?.test){ }
String test String
if(typeof yyy === 'string'){ }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Property test Object
String test Object
Property test String
String test String

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/111.0

Browser/OS: Firefox 111 on Windows

View result in a separate tab

Test name	Executions per second
Property test Object	577365056.0 Ops/sec
String test Object	1077954304.0 Ops/sec
Property test String	711973120.0 Ops/sec
String test String	1052632576.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks, measuring the performance of different approaches for various scenarios. The provided benchmark definition json and individual test cases are used to analyze the results.

**Benchmark Definition**

The benchmark definition json contains metadata about the benchmark, including:

* `Name`: The name of the benchmark.
* `Description`: A brief description of the benchmark.
* `Script Preparation Code`: The JavaScript code that is prepared before running each test case.
* `Html Preparation Code`: An empty string, indicating that no HTML preparation code is required.

**Test Cases**

The individual test cases are defined in an array, with each object containing:

* `Benchmark Definition`: A JavaScript string representing the benchmark definition for a specific test case. These definitions use optional chaining (`?.`) and type checking (`typeof`).
* `Test Name`: A descriptive name for the test case.

Here's a breakdown of the test cases:

1. **Property test Object**: `if(xxx?.test){\r\n}` - This test case checks if the property `test` exists on an object.
2. **String test Object**: `if(typeof xxx === 'string'){\r\n}` - This test case checks if a variable is a string using `typeof`.
3. **Property test String**: `if(yyy?.test){\r\n}` - This test case checks if the property `test` exists on a string.
4. **String test String**: `if(typeof yyy === 'string'){\r\n}` - This test case checks if a string is a string using `typeof`.

**Library Usage**

In this benchmark, no libraries are explicitly mentioned or used.

**Special JavaScript Features or Syntax**

The use of optional chaining (`?.`) and type checking (`typeof`) is noteworthy. Optional chaining was introduced in ECMAScript 2020 (ES2020) as a feature to safely navigate nested properties.

Here's an explanation of these features:

* `?.`:
	+ This syntax allows you to access a nested property without causing a runtime error if the property doesn't exist.
	+ It's equivalent to checking `if (x && x.y)` in older JavaScript versions.
	+ In this benchmark, it's used to check for the existence of properties on objects (`xxx?.test` and `yyy?.test`).
* `typeof`:
	+ This function returns a string indicating the type of its argument.
	+ It's used to check if a variable is a string or not (in the "String test Object" and "String test String" cases).

**Other Alternatives**

If you were to rewrite this benchmark without using optional chaining (`?.`) and `typeof`, you could use alternative approaches:

* For the property existence checks, you could use `in` operator or `hasOwnProperty()` method.
* For the string type checking, you could use a simple function like `isString()`. However, keep in mind that this wouldn't be as concise or readable as using `typeof`.

In summary, MeasureThat.net's benchmark uses optional chaining (`?.`) and `typeof` to measure performance differences for various JavaScript scenarios. The test cases cover basic property existence checks on objects and strings, demonstrating the use of these features.

Related benchmarks:

Check is string or object with property (version: 0)

You don't need to make add for loops in your test scenarios, the benchmark does it itself.

Comparing performance of: Property test Object vs String test Object vs Property test String vs String test String

Created: one year ago by: Guest

Jump to the latest result

Property test Object

String test Object

Property test String

String test String

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):