Benchmark: Typeof vs raw accessor 2

Script Preparation code:

var data = { 
  get: function() { 
    if (Math.random() < 0.000000001) { 
      console.log(5); 
    } 
  } 
};
var fn = function() {  
  if (Math.random() < 0.000000001) { 
    console.log(5); 
  } 
}

Tests:

typeof function
var d1 = Math.random() > 0.5 ? data : fn; var d2 = d1 === data ? fn : data; typeof d1 === 'function' ? d1() : d1.get(); typeof d2 === 'function' ? d2() : d2.get();
typeof object
var d1 = Math.random() > 0.5 ? data : fn; var d2 = d1 === data ? fn : data; typeof d1 === 'object' ? d1() : d1.get(); typeof d2 === 'object' ? d2() : d2.get();
raw
data.get(); fn();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
typeof function
typeof object
raw

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation.

The provided JSON represents a JavaScript benchmark test case on MeasureThat.net. The goal of this test is to compare three different approaches for determining whether an object or function is being accessed using `typeof`.

**Options being compared:**

1. **`typeof function`**: This approach checks if the variable on the left-hand side (`d1` and `d2`) is a function by applying `typeof` to it. If it's a function, the code inside the `if` statement will be executed; otherwise, it will access the `get()` method of the object.
2. **`typeof object`**: Similar to the first approach, but this one checks if the variable is an object instead of a function. The code will execute if the variable is an object, and otherwise, it will access the `get()` method of the object.
3. **`raw`**: This approach simply calls the `get()` or `()` method directly on the variable (`d1` and `d2`). It doesn't use `typeof` to determine whether the variable is a function or an object.

**Pros and cons of each approach:**

*   **`typeof function` and `typeof object`**: These approaches can be efficient for determining whether a variable is a function or an object, as they only require a single `typeof` operation. However, if the variable happens to be a number, string, or other primitive type, `typeof` will return `'number'`, `'string'`, etc., which may not be what you expect.
*   **`raw`**: This approach is simpler and might be faster in some cases since it avoids the overhead of using `typeof`. However, if the variable is a function or an object that doesn't have a `get()` method, this approach will throw an error.

**Library:**

None

**Special JS feature/syntax:**

There are no specific JavaScript features or syntaxes being tested in this benchmark. The code only uses standard JavaScript syntax and features.

**Considerations:**

When choosing between these approaches, consider the following factors:

*   Performance: If you need to determine whether a variable is a function or an object frequently, using `typeof` might be more efficient.
*   Error handling: If you expect the variables to sometimes not be functions or objects (e.g., due to user input), you may want to use the `raw` approach for its simplicity and lack of errors.
*   Readability: The `raw` approach is straightforward, while the `typeof function` and `typeof object` approaches might require more mental context to understand.

**Other alternatives:**

If you need to compare these approaches in a different context or with additional variables, consider using other methods:

*   **Type checking libraries:** If your project requires robust type checking (e.g., TypeScript), you can use dedicated libraries like `type-check` or `ts-type`.
*   **Function signature inspection:** For certain use cases, you might want to inspect the function's signature (e.g., number of arguments) instead of determining whether it's a function.
*   **Other data types detection methods:** Depending on your specific requirements, you could also explore detecting other data types using `instanceof`, `constructor.name`, or other techniques.

Keep in mind that for most use cases, the approaches being compared here are sufficient.

Related benchmarks:

Typeof vs raw accessor 2 (version: 0)

Comparing performance of: typeof function vs typeof object vs raw

Created: 5 years ago by: Guest

Jump to the latest result

typeof function

typeof object

raw

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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