Benchmark: Arrow function vs bind function

Script Preparation code:

arrowFn = () => this
bindFn = (function() { return this }).bind(this)

Tests:

Arrow function
arrowFn()
Bind function
bindFn()

Historical Performance Data aggregated from 93 community runs

Desktop Results:

Chrome 62 runs

Arrow function

91.3M/s

Bind function

86.2M/s

View exact numbers

✓ Arrow function: 91,273,104 ops/sec
• Bind function: 86,224,176 ops/sec

Firefox 25 runs

Arrow function

1463.5M/s

Bind function

98.7M/s

Fastest: Arrow function (14.8x faster)

View exact numbers

✓ Arrow function: 1,463,457,920 ops/sec
• Bind function: 98,683,800 ops/sec

Mobile Results:

Chrome 6 runs

Bind function

90.6M/s

Arrow function

86.3M/s

View exact numbers

✓ Bind function: 90,621,936 ops/sec
• Arrow function: 86,330,336 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Arrow function
Bind function

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 19 days ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36

Browser/OS: Chrome 149 on Linux

View result in a separate tab

Arrow function

96.4M/s

Bind function

95.7M/s

View exact numbers

Test name	Executions per second
✓ Arrow function	96,352,080 Ops/sec
Bind function	95,748,984 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is defined in JSON format, which describes two test cases:

1. **"Arrow function vs bind function"**: This is the main benchmark definition, which compares the performance of arrow functions (`arrowFn`) with bind functions (`bindFn`).
2. The script preparation code for this benchmark is provided:
   - `arrowFn = () => this`: Defines an arrow function that returns `this`.
   - `bindFn = (function() { return this }).bind(this)`: Defines a bind function using the immediately invoked function expression (IIFE) pattern, which binds the context of `this` to the current execution context.

**Options Compared**

Two options are being compared:

1. **Arrow functions (`arrowFn`)**: A concise and modern way of defining functions in JavaScript.
2. **Bind functions (`bindFn`)**: An older way of binding the context of `this` to a function, typically used for compatibility reasons or when working with older browsers.

**Pros and Cons**

- **Arrow functions (arrowFn)**:
  - Pros: More concise, easier to read, and less prone to errors due to the lack of `this` keyword resolution.
  - Cons: May not work as expected in certain situations (e.g., using `arguments` or `bind`) or older browsers that don't support them.

- **Bind functions (bindFn)**:
  - Pros: More flexible, allows for more control over the binding context of `this`, and works across a wider range of environments.
  - Cons: Less concise, may be less readable due to the use of an IIFE pattern, and prone to errors if not used correctly.

**Other Considerations**

- The benchmark is likely comparing the performance of these two approaches because they have different implications for code readability, maintainability, and browser support.
- The choice between arrow functions and bind functions usually depends on the specific requirements of the project, such as compatibility with older browsers or personal preference.

**Library Usage (None)**

There are no libraries used in this benchmark definition.

**Special JS Feature/ Syntax**

- There is a special JavaScript feature being tested: **arrow functions**. Arrow functions were introduced in ECMAScript 2015 and provide a concise syntax for defining small, anonymous functions.
- Another relevant feature: the use of the `bind` method on functions, which was also introduced with arrow functions.

**Alternatives**

Other alternatives to compare when testing JavaScript performance or features might include:

1. **Regular function expressions**: A more traditional way of defining functions in JavaScript.
2. **Generator functions**: Allow for more complex control flow and iteration patterns.
3. **Async/await syntax**: For asynchronous code execution and handling promises.

Keep in mind that the choice of alternatives will depend on the specific requirements or goals of the benchmark, as well as any relevant libraries or frameworks used.

Arrow function vs bind function (version: 0)

Comparing performance of: `Arrow function vs Bind function`

Created: 6 years ago by: Registered User

Go to the latest result

Arrow function

Bind function

Historical Performance Data aggregated from 93 community runs

Desktop Results:

Chrome 62 runs

Firefox 25 runs

Mobile Results:

Chrome 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Arrow function vs bind function (version: 0)

Comparing performance of: Arrow function vs Bind function

Created: 6 years ago by: Registered User

Go to the latest result

Arrow function

Bind function

Historical Performance Data aggregated from 93 community runs

Desktop Results:

Chrome 62 runs

Firefox 25 runs

Mobile Results:

Chrome 6 runs

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: `Arrow function vs Bind function`