Benchmark: error handling: cost of try catch vs return (instanceof check vs prop check)

Script Preparation code:

function returning() {
  return Error()
}

function throwing() {
  throw Error()
}

Tests:

returning instanceof check
const x = returning() if (x instanceof Error) {}
throwing
try { throwing() } catch(x) {}
returning prop check
const x = returning() if ('name' in x) {}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
returning instanceof check
throwing
returning prop check

Fastest: N/A

Slowest: N/A

Latest run results:

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

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

**Benchmark Definition**

The benchmark is designed to compare the performance of different approaches for error handling in JavaScript:

1. **Try-catch block**: The `throwing` test case uses a try-catch block to throw an exception, which is then caught by the `catch` clause.
2. **Return statement with instanceof check**: The `returning instanceof check` test case returns an instance of an error object using the `Error()` constructor and checks if it's an instance of Error using the `instanceof` operator.
3. **Return statement with property check**: The `returning prop check` test case returns an instance of an error object using the `Error()` constructor and checks if a specific property (`name`) exists on the returned object.

**Options being compared**

The benchmark is comparing three options for error handling:

1. **Try-catch block**: This approach involves throwing an exception and then catching it.
2. **Return statement with instanceof check**: This approach involves returning an instance of an error object and checking if it's an instance of Error using the `instanceof` operator.
3. **Return statement with property check**: This approach involves returning an instance of an error object and checking if a specific property (`name`) exists on the returned object.

**Pros and Cons**

Here are some pros and cons for each approach:

1. **Try-catch block**:
	* Pros: Can handle unexpected errors, provides more control over the flow of the program.
	* Cons: Can be slower due to the overhead of throwing and catching exceptions.
2. **Return statement with instanceof check**:
	* Pros: Can be faster since it doesn't involve throwing an exception and then catching it.
	* Cons: May not work for all types of errors, requires explicit checking using `instanceof`.
3. **Return statement with property check**:
	* Pros: Fast and efficient, can handle most cases without requiring additional checks.
	* Cons: May not work correctly if the error object doesn't have the expected property.

**Libraries and Special JS Features**

There is no library mentioned in the benchmark definition, but there are some special JavaScript features being used:

1. **`instanceof` operator**: This operator is used to check if an object is an instance of a particular constructor.
2. **Error() constructor**: This constructor creates a new Error object with a specific message and optional additional information.

**Other Considerations**

The benchmark also considers the following factors:

1. **Browser and device platform**: The benchmark results are provided for Firefox 117 on Windows Desktop, which might not be representative of other browsers or platforms.
2. **Number of executions per second**: This metric provides an estimate of how many times each test case was executed in a second.

**Alternatives**

If you're interested in exploring alternative approaches to error handling, consider the following:

1. **Async/await with try-catch**: Using async/await with try-catch blocks can provide a more concise and readable way to handle errors.
2. **Error handling libraries**: There are several libraries available that provide advanced error handling features, such as error boundary libraries or error tracking services.
3. **Custom error handling mechanisms**: Depending on the specific use case, you might want to implement custom error handling mechanisms using techniques like error codes or exception hierarchies.

Related benchmarks:

error handling: cost of try catch vs return (instanceof check vs prop check) (version: 1)

Comparing performance of: returning instanceof check vs throwing vs returning prop check

Created: 2 years ago by: Registered User

Jump to the latest result

returning instanceof check

throwing

returning prop check

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):