Benchmark: If Lookup vs. Switch Lookup

Script Preparation code:

var ERRORS = {
  400: 'Bad Request',
  401: 'Unauthorized',
  403: 'Forbidden',
  404: 'Not Found',
};

var serverResponse = {
  error: 404,
};

Tests:

If Lookup
function mappingError (response) { let errorCode = 400; if (response && response.error && ERRORS[response.error]) { errorCode = response.error; } return ERRORS[errorCode]; } mappingError(serverResponse);
Switch Lookup
function switchError (response) { switch (response.error) { case 400: return ERRORS[400]; case 401: return ERRORS[401]; case 402: return ERRORS[402]; case 404: return ERRORS[404]; default: return ERRORS[400]; } } switchError(serverResponse);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
If Lookup
Switch Lookup

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.

Let's dive into the explanation of the provided benchmark.

**Overview**

The benchmark measures the performance difference between two approaches: If Lookup and Switch Lookup, when accessing an error code in a JavaScript object.

**Benchmark Definition JSON**

The benchmark definition is represented by two objects:

1. **Script Preparation Code**: This section contains the JavaScript code that sets up the environment for the benchmark. In this case, it defines an `ERRORS` object with predefined error codes and their corresponding descriptions.
2. **Html Preparation Code**: There is no HTML preparation code provided in this example.

**Individual Test Cases**

There are two test cases:

1. **If Lookup**
```javascript
function mappingError(response) {
  let errorCode = 400;
  if (response && response.error && ERRORS[response.error]) {
    errorCode = response.error;
  }
  return ERRORS[errorCode];
}
```
This function uses the If Lookup approach to retrieve the error description from the `ERRORS` object.

2. **Switch Lookup**
```javascript
function switchError(response) {
  switch (response.error) {
    case 400:
      return ERRORS[400];
    case 401:
      return ERRORS[401];
    case 402:
      return ERRORS[402];
    case 404:
      return ERRORS[404];
    default:
      return ERRORS[400];
  }
}
```
This function uses the Switch Lookup approach to retrieve the error description from the `ERRORS` object.

**Library and Purpose**

There is no external library used in this benchmark. The `ERRORS` object is a custom-defined JavaScript object that contains predefined error codes and their corresponding descriptions.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax used in this benchmark.

**Pros and Cons of Each Approach**

1. **If Lookup**
	* Pros:
		+ Simple and easy to understand
		+ Can be more efficient for large objects (e.g., when the object has many keys)
	* Cons:
		+ May have slower performance due to the need to perform a lookup in the `ERRORS` object
2. **Switch Lookup**
	* Pros:
		+ Can be faster than If Lookup, especially for small objects or cases where the error code is often one of the first few values in the object
	* Cons:
		+ More complex and harder to understand due to the use of a switch statement

**Other Alternatives**

In JavaScript, there are other ways to access an object value. Some alternatives to If Lookup and Switch Lookup include:

1. **Object.keys()**: Returns an array of all the keys in the `ERRORS` object.
2. **Array.prototype.indexOf()**: Returns the index of the first occurrence of a specific key-value pair in the `ERRORS` object.
3. **Object.values()**: Returns an array of all the values in the `ERRORS` object.

However, these alternatives may not be as efficient or readable as If Lookup and Switch Lookup in this specific benchmark scenario.

Related benchmarks:

If Lookup vs. Switch Lookup (version: 1)

Comparing performance of: If Lookup vs Switch Lookup

Created: 7 years ago by: Registered User

Jump to the latest result

If Lookup

Switch Lookup

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):