Benchmark: variable vs property (var vs this.property) - v2

Script Preparation code:

var a=123,b=123,c=123;
this.d=this.e=this.f=123;

Tests:

variable
for (let i = 0; i < 100; i++) { a + b + c + i; }
this.property
for (let i = 0; i < 100; i++) { this.d + this.e + this.f + i; }
window.property
for (let i = 0; i < 100; i++) { window.d + window.e + window.f + i; }
this.variable
for (let i = 0; i < 100; i++) { this.a + this.b + this.c + i; }
window.variable
for (let i = 0; i < 100; i++) { window.a + window.b + window.c + i; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
variable
this.property
window.property
this.variable
window.variable

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 12 days ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36

Browser/OS: Chrome 150 on Mac OS X 10.15.7

View result in a separate tab

variable

3.4M/s

window.variable

2.9M/s

window.property

2.9M/s

this.property

289K/s

this.variable

230K/s

View exact numbers

Test name	Executions per second
✓ variable	3,371,403 Ops/sec
window.variable	2,933,010 Ops/sec
window.property	2,925,564 Ops/sec
this.property	288,962 Ops/sec
this.variable	230,293 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition:**

The benchmark definition is provided in JSON format, which defines two approaches for comparing variables and properties:

* `var vs property (var vs this.property)`: This approach compares the performance of using a traditional variable (`var`) versus an object property (`this.property`).
* `variable vs property (this.variable vs window.property)`: This approach compares the performance of accessing variables directly (using dot notation) versus accessing properties on the `window` object (using dot notation).

**Options being compared:**

The benchmark compares two options:

1. Using a traditional variable (`var`) to store and access values.
2. Using an object property (`this.property` or `window.property`) to store and access values.

**Pros and Cons of each approach:**

* **Traditional Variable (`var`):**
	+ Pros:
		- Simple and intuitive syntax.
		- Familiar to most developers.
		- Often used in traditional JavaScript coding styles.
	+ Cons:
		- Can lead to global variable pollution if not properly scoped.
		- May incur additional overhead due to scope resolution mechanisms.
* **Object Property (`this.property` or `window.property`):**
	+ Pros:
		- Encapsulates variables within a specific scope, reducing global variable pollution risks.
		- Can improve code readability and maintainability by using descriptive property names.
	+ Cons:
		- May require more effort to set up and use correctly (e.g., accessing properties on the `window` object).
		- Some older browsers or environments might not support or behave as expected with object properties.

**Library usage:**

There is no explicit library mentioned in the benchmark definition. However, the `this` keyword is used to access object properties, which implies the use of a JavaScript engine's built-in functionality. If we consider libraries like Lodash or Underscore.js that might be used for utility functions, there are none explicitly mentioned.

**Special JS feature or syntax:**

There is no special JavaScript feature or syntax being tested in this benchmark. The focus is on comparing two approaches: using traditional variables versus object properties.

**Alternative approaches:**

Other approaches to compare variable and property usage could include:

* Using ES6 classes instead of objects for encapsulation.
* Utilizing modules (e.g., ES6 imports/export or CommonJS) to manage variable scope.
* Implementing custom caching mechanisms or memoization libraries to optimize performance.

These alternatives might provide additional insights into the trade-offs between different approaches, but they are not explored in this specific benchmark.

variable vs property (var vs this.property) - v2 (version: 0)

Comparing performance of: `variable vs this.property vs window.property vs this.variable vs window.variable`

Created: one year ago by: Guest

Go to the latest result

variable

this.property

window.property

this.variable

window.variable

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

variable vs property (var vs this.property) - v2 (version: 0)

Comparing performance of: variable vs this.property vs window.property vs this.variable vs window.variable

Created: one year ago by: Guest

Go to the latest result

variable

this.property

window.property

this.variable

window.variable

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `variable vs this.property vs window.property vs this.variable vs window.variable`