Benchmark: hasOwnProperty string vs number

Script Preparation code:

var obj = { a: 1, b: 2, c: 3, 3: true, d: 4, e: 5 };

Tests:

number
obj.hasOwnProperty( 3 );
string
obj.hasOwnProperty( '3' );

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
number
string

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the world of MeasureThat.net, where JavaScript microbenchmarks come to life!

**Benchmark Overview**

The provided JSON represents a benchmark test case that compares the performance of two approaches: using a numeric value (`3`) and a string representation of the same value (`'3'`) in the `hasOwnProperty` method.

**Options Being Compared**

Two options are being compared:

1. **Numeric Value**: Using the literal numeric value `3` as the key in the object.
2. **String Representation**: Using the string `'3'` as the key in the object.

**Pros and Cons of Each Approach**

* **Numeric Value**:
	+ Pros: Faster lookup times, as numeric values are typically stored as integers in JavaScript objects.
	+ Cons: May not work correctly if the number is a non-integer value or has decimal points (due to type coercion).
* **String Representation**:
	+ Pros: Can handle non-numeric values and string representations of numbers, making it more flexible.
	+ Cons: Slower lookup times due to string comparison.

**Library Used**

None, as this benchmark is a basic JavaScript test case without any external libraries or dependencies.

**Special JS Feature/Syntax**

The `hasOwnProperty` method is a built-in JavaScript method that checks if an object has the specified property as its own property (i.e., not inherited from its prototype chain). It's a common and useful method in many JavaScript scenarios.

**Benchmark Preparation Code Explanation**

The script preparation code defines an object `obj` with several properties, including one with a numeric key (`3`) and another with a string representation of the same value (`'3'`). This object is used as the test subject for the benchmark.

**Individual Test Cases**

Each individual test case consists of two parts:

1. A **Benchmark Definition**: A JavaScript statement that uses either the numeric value or string representation of the key in the `hasOwnProperty` method.
2. A **Test Name**: The name assigned to each test case, which corresponds to the type of key used (numeric or string).

**Latest Benchmark Result**

The provided JSON result shows the benchmark execution data for two test cases:

1. **Number**: The Chrome 98 browser on a desktop with Mac OS X 10.15.7 achieved an executions per second rate of approximately 11,993,944.
2. **String**: The same browser and device platform achieved an executions per second rate of approximately 11,413,027.

These results suggest that using numeric values is faster than using string representations in the `hasOwnProperty` method.

**Other Alternatives**

If you're interested in exploring other benchmarking platforms or approaches, some alternatives include:

1. **JSPerf**: Another popular benchmarking platform for JavaScript.
2. **Benchmarking libraries**: Libraries like Benchmark.js or js-benchmark provide a structured way to create and compare benchmarks in your own projects.
3. **Local testing frameworks**: Frameworks like Jest or Mocha can be used to write and run benchmarks locally, allowing for more control over the testing environment.

I hope this explanation has been helpful in understanding the MeasureThat.net benchmark!

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4715.0 Safari/537.36

Browser/OS: Chrome 98 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
number	11919944.0 Ops/sec
string	11438127.0 Ops/sec

Related benchmarks:

hasOwnProperty string vs number (version: 0)

Object lookup performance

Comparing performance of: number vs string

Created: 3 years ago by: Guest

Jump to the latest result

number

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):