Benchmark: Adding fields to functions

Tests:

fun-assign
var f; var sum = 0; for(var i = 0; i <= 100000; i += 1) { f = function(j) { return j; }; f.name = "f"; sum += f(i); } console.log(f.name);
no-assign-named
var f; var sum = 0; for(var i = 0; i <= 100000; i += 1) { f = function f(j) { return j; }; sum += f(i); } console.log(f.name);
object-assign
var f; var sum = 0; var o = {}; for(var i = 0; i <= 100000; i += 1) { f = function f(j) { return j; }; o.name = "f"; sum += f(i); } console.log(f.name);
define-prop
var f; var sum = 0; for(var i = 0; i <= 100000; i += 1) { f = function(j) { return j; }; Object.defineProperty(f, 'name', {value: 'f'}); sum += f(i); } console.log(f.name);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
fun-assign
no-assign-named
object-assign
define-prop

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Measuring performance in JavaScript is crucial, and measuring that performance in microbenchmarks like MeasureThat.net helps to understand the optimization opportunities.

**Benchmark Description**

The provided benchmark measures how fast it is to assign a property name to a function using different methods:

1. **Direct Assignment**: `f.name = "f";` - This method assigns the property name directly to the function.
2. **Object Assignment**: `o.name = "f";` - Similar to direct assignment, but uses an object (`o`) as a proxy.
3. **Property Definition**: `Object.defineProperty(f, 'name', {value: 'f'})` - This method uses the `Object.defineProperty()` function to define a property on the function.

**Options Comparison**

The benchmark compares these three approaches:

*   **Pros and Cons:**
    *   **Direct Assignment (fun-assign)**:
        *   Pros:
            *   Simple, intuitive syntax.
            *   Fast execution time.
        *   Cons:
            *   May not be supported in older JavaScript engines or browsers.
            *   Can lead to naming conflicts if multiple functions have the same name.
    *   **Object Assignment (object-assign)**:
        *   Pros:
            *   More flexible than direct assignment, as it uses an object as a proxy.
            *   Can be used to avoid naming conflicts.
        *   Cons:
            *   Requires creating and using an extra object, which can add overhead.
    *   **Property Definition (define-prop)**:
        *   Pros:
            *   More explicit and flexible than direct assignment or object assignment.
            *   Allows for more fine-grained control over property definitions.
        *   Cons:
            *   Requires knowledge of the `Object.defineProperty()` function, which can be a barrier to adoption.

**Library Usage**

In the benchmark, none of the libraries are explicitly mentioned. However, it's worth noting that some browsers may use libraries or frameworks under the hood to optimize performance.

**Special JS Features or Syntax**

There is no special JavaScript feature or syntax used in this benchmark.

**Other Alternatives**

If you want to explore other approaches to measuring performance in JavaScript:

*   **Use built-in `Date.now()`**: Measure execution time using `Date.now()` as a reference point.
*   **Profile your code with the Chrome DevTools Profiler**: Analyze your code's execution flow and identify performance bottlenecks.
*   **Consider using WebAssembly (WASM) for performance-critical sections**: If you're developing high-performance applications, WASM might be an attractive option.

Keep in mind that these alternatives may require more setup or expertise than running a benchmark on MeasureThat.net.

Related benchmarks:

Adding fields to functions (version: 0)

Comparing performance of: fun-assign vs no-assign-named vs object-assign vs define-prop

Created: 9 years ago by: Guest

Jump to the latest result

fun-assign

no-assign-named

object-assign

define-prop

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):