Benchmark: Errors vs arrs - MeasureThat.net

Script Preparation code:

var err = new Error("boo")
var errEnum = { SomeError: 1 }

Tests:

errs
try { (() => { throw err })() } catch(e) { console.log("caught err", e) }
arrs
let [res, err] = (() => { return [0, errEnum.SomeError] })() if (err > 0) console.log("arrs err", err)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
errs
arrs

Fastest: N/A

Slowest: N/A

Latest run results:

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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 definition and test cases.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark that compares two approaches to handling errors: traditional try-catch blocks (`"errs"` test case) versus destructuring assignment with arrays (`"arrs"` test case).

**Script Preparation Code**

The script preparation code defines two variables:

1. `err`: an instance of the `Error` class, initialized with a custom error message `"boo"`.
2. `errEnum`: an object containing a single property `SomeError` with value 1.

**Html Preparation Code**

There is no HTML preparation code provided, which means that this benchmark only runs in the JavaScript engine and does not involve any DOM-related interactions.

**Individual Test Cases**

The two test cases are:

### "errs"

This test case attempts to throw an error using a try-catch block:
```javascript
try {
  (() => {
    throw err;
  })();
} catch (e) {
  console.log("caught err", e);
}
```
In this approach, the error is caught and logged to the console.

### "arrs"

This test case uses destructuring assignment with arrays to extract the error from an array:
```javascript
let [res, err] = (() => {
  return [0, errEnum.SomeError];
})();
if (err > 0) console.log("arrs err", err);
```
In this approach, the array is unwrapped, and the `SomeError` value is extracted as an error variable.

**Options Compared**

The two test cases compare the performance of traditional try-catch blocks versus destructuring assignment with arrays. The primary difference lies in how errors are handled:

*   **Try-Catch Blocks**: This approach involves a manual catch clause to handle the thrown error.
*   **Destructuring Assignment**: This method uses array destructuring to extract the error from an array, which can be more concise but may incur performance overhead due to unnecessary computations.

**Pros and Cons**

*   **Try-Catch Blocks**
    *   Pros:
        *   More explicit and readable way of handling errors.
        *   Can handle multiple types of exceptions using different catch clauses.
    *   Cons:
        *   May introduce additional overhead due to the catch clause.
        *   Can be slower due to the JavaScript engine's need to execute the catch block.
*   **Destructuring Assignment**
    *   Pros:
        *   More concise and expressive way of handling errors.
        *   Can potentially be faster since it avoids unnecessary computations.
    *   Cons:
        *   May require additional processing power to unwrap arrays.
        *   Less readable or maintainable for complex error handling scenarios.

**Special JS Feature/Syntax**

In this benchmark, the use of arrow functions (`=>`) is not unusual in modern JavaScript. The `throw` keyword followed by an error object is also a standard way of throwing errors in JavaScript.

**Other Alternatives**

Other approaches to handling errors in JavaScript include:

*   Using `try-catch` blocks with a single catch clause that catches all exceptions.
*   Utilizing the built-in `Error` class and its methods, such as `error.message` or `error.stack`.
*   Implementing custom error-handling logic using callbacks or async/await.

Keep in mind that the choice of error handling approach often depends on the specific use case and performance requirements.

Related benchmarks:

Errors vs arrs (version: 0)

Comparing performance of: errs vs arrs

Created: 4 years ago by: Guest

Jump to the latest result

errs

arrs

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):