Benchmark: Object creation vs function definition vs arror function vs function expression vs named function expression

Tests:

Object creation
const a = {};
Arrow function
const a = () => {}
Function definition
function a() {}
Function expression
const a = function() {}
Named function expression
const a = function b() {}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object creation
Arrow function
Function definition
Function expression
Named function expression

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark measures the performance difference between different ways of defining functions in JavaScript:

1. Object creation (`const a = {};`)
2. Function definition (`function a() {}`)
3. Arrow function (`const a = () => {}`)
4. Function expression (`const a = function() {}`)
5. Named function expression (`const a = function b() {}`)

**Test Cases**

Each test case consists of a benchmark definition and a test name.

* Object creation: `const a = {};`
* Arrow function: `const a = () => {}`
* Function definition: `function a() {}`
* Function expression: `const a = function() {}`
* Named function expression: `const a = function b() {}`

**Library Used**

None, as all tests are basic JavaScript syntax.

**Special JS Features/Syntax**

There are no special features or syntax used in this benchmark. It only focuses on the performance differences between different ways of defining functions.

**Options Compared**

The benchmark compares the following options:

**Pros and Cons**

Here's a brief summary of the pros and cons for each option:

1. **Object creation**: Creates an empty object with no additional properties or methods. Pros: lightweight, easy to create. Cons: might not be optimized for performance.
2. **Function definition**: Defines a function with an explicit name and signature. Pros: clear, maintainable. Cons: might lead to slower execution due to function overhead.
3. **Arrow function**: A concise way of defining small functions without the need for `this` context management. Pros: compact, easy to read. Cons: can limit reusability or flexibility in some cases.
4. **Function expression**: Wraps a function definition within a variable declaration. Pros: flexible, reusable. Cons: might make code harder to read if not used correctly.
5. **Named function expression**: Similar to a function expression but with an explicit name for the function. Pros: clear, maintainable. Cons: similar limitations as function definition.

**Other Alternatives**

There are other ways of defining functions in JavaScript, such as:

* Immediately Invoked Function Expression (IIFE): `(function() {...})();`
* Anonymous function: `var a = function(){...};`

However, these alternatives are not directly compared in this benchmark.

**Benchmark Results**

The latest benchmark results show the execution rate per second for each test case, measured by `ExecutionsPerSecond`. The browser and device used is Chrome 118 on a Linux desktop.

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36

Browser/OS: Chrome 118 on Linux

View result in a separate tab

Test name	Executions per second
Object creation	773635904.0 Ops/sec
Arrow function	774658112.0 Ops/sec
Function definition	775688256.0 Ops/sec
Function expression	774663488.0 Ops/sec
Named function expression	774586624.0 Ops/sec

Related benchmarks:

Object creation vs function definition vs arror function vs function expression vs named function expression (version: 0)

Comparing performance of: Object creation vs Arrow function vs Function definition vs Function expression vs Named function expression

Created: one year ago by: Guest

Jump to the latest result

Object creation

Arrow function

Function definition

Function expression

Named function expression

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):