Benchmark: global variable access

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

let b = blur

Tests:

implicit
blur()
explicit
window.blur()
variable
b()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
implicit
explicit
variable

Fastest: N/A

Slowest: N/A

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/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Linux

View result in a separate tab

Test name	Executions per second
implicit	17758966.0 Ops/sec
explicit	16956854.0 Ops/sec
variable	15703838.0 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated one year ago):

LLMs can make mistakes. Check important info.

The benchmark you provided focuses on assessing the performance of accessing the `blur` function in three different ways: implicitly, explicitly through the global window object, and via a variable reference. Here's a detailed breakdown of what each approach entails, along with the pros and cons.

### Benchmark Options

1. **Implicit Access: `blur()`**
   - **Description**: This approach calls the `blur` function directly, relying on its availability in the current scope without any object reference.
   - **Executions Per Second**: 17,758,966
   - **Pros**: 
     - Generally faster as it directly accesses the function without any added context.
   - **Cons**:
     - This approach may lead to issues in environments where the function is not defined or is overridden, as there’s no explicit reference to its source.

2. **Explicit Access: `window.blur()`**
   - **Description**: This approach calls the `blur` function through the `window` object, which is the global object in browsers.
   - **Executions Per Second**: 16,956,854
   - **Pros**:
     - More explicit and clear, making it apparent where the function is coming from. This can help avoid ambiguity in variable scopes.
   - **Cons**:
     - Slightly slower than implicit access because of the additional scope resolution needed to reference the window object.

3. **Variable Access: `b()`**
   - **Description**: Accesses the `blur` function by assigning it to a variable (`b`) and then invoking that variable.
   - **Executions Per Second**: 15,703,838
   - **Pros**:
     - Can help in creating more readable code, especially if you're passing functions around.
     - Allows for potential ease of swapping out function implementations if `b` were to be reassigned.
   - **Cons**:
     - This is generally the slowest method in this benchmark due to the additional indirection (i.e., retrieving the function reference from the variable) before execution.

### Considerations

- **Contextual Awareness**: The implicit method assumes that the `blur` function is universally available. If used in a different context (like a module or non-browser environment), it may throw an error.
- **Browser Efficiency**: Benchmark results can vary based on browser optimizations and may be influenced by the JavaScript engine in use (V8 for Chrome in this case).
- **Development Practices**: Leveraging explicit calls is often preferred in larger codebases to increase maintainability and clarity, especially when working in environments where context can change.

### Alternatives

- **Using Function References**: Instead of using the window object for functions predefined by the browser, you might also explore modular JavaScript with ES6 imports to manage dependencies, allowing for organized and maintainable code.
- **Optimization Strategies**: For large applications, consider implementing caching mechanisms or utilizing function binding techniques to manage context more efficiently while still achieving optimal performance.

Overall, the benchmark provides valuable insights into the performance implications of different variable access methods in JavaScript. It emphasizes the importance of balancing performance with code clarity, especially in more complex applications.

Related benchmarks:

global variable access (version: 1)

Comparing performance of: implicit vs explicit vs variable

Created: one year ago by: Guest

Jump to the latest result

implicit

explicit

variable

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated one year ago):