Benchmark: test checking is key exists in object

Script Preparation code:

const indentSizes = {
  ma: true,
  mb: true,
  ml: true,
  mr: true,
  mt: true,
  mx: true,
  my: true,
  pa: true,
  pb: true,
  pl: true,
  pr: true,
  pt: true,
  px: true,
  py: true,
};

function getHasIndents (indentsProps) {
  // eslint-disable-next-line no-restricted-syntax
  for (const prop in indentsProps) {
    if (indentSizes[prop]) return true;
  }

  return false;
};

function getFastHasIndents () {
  return true;
};

var indentsProps = {
  someProps: 1,
  otherProp: 2,
  thrirdProp: 3,
  manyOtherprops: 44,
  my: 2,
}

Tests:

test for in checing
getHasIndents(indentsProps)
fast mock
getFastHasIndents()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
test for in checing
fast mock

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.

I'll break down the provided benchmark definition and explain what's being tested, compared, and the pros and cons of different approaches.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark that tests two functions: `getHasIndents` and `getFastHasIndents`. The benchmark is designed to measure the performance difference between these two functions.

**What's being tested?**

The test cases are:

1. `getHasIndents(indentsProps)`: This function checks if a key exists in an object using the `in` operator.
2. `getFastHasIndents()`: This function simply returns `true` without performing any actual check.

**Comparison**

The benchmark compares the performance of these two functions:

* `getHasIndents(indentsProps)` uses a traditional approach with a loop to iterate over the object's properties and checks if the key exists.
* `getFastHasIndents()` is a mock implementation that always returns `true`, without any actual check.

**Pros and Cons**

1. **Traditional Approach (`getHasIndents(indentsProps)`)**
	* Pros:
		+ Accurately checks for key existence in the object.
	* Cons:
		+ May be slower due to the loop iteration.
2. **Mock Implementation (`getFastHasIndents()`)**
	* Pros:
		+ Always returns `true`, making it faster and more predictable.
	* Cons:
		+ Does not accurately check for key existence in the object.

**Library and Special Features**

The benchmark does not use any external libraries, but it does utilize a custom `indentSizes` object to make the test more relevant. This object is used as an argument to the `getHasIndents` function to simulate a real-world scenario where keys need to be checked.

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

**Other Alternatives**

If you want to improve the performance of the traditional approach, consider using a more efficient data structure, such as a Map, and utilizing the `hasOwnProperty()` method:

```javascript
function getHasIndents(indentsProps) {
  return Object.prototype.hasOwnProperty.call(indentsProps, 'someKey');
}
```

Keep in mind that this optimization may not be necessary depending on the specific requirements of your use case.

I hope this explanation helps you understand the benchmark and its components!

Related benchmarks:

test checking is key exists in object (version: 4)

test checking is key exists in object

Comparing performance of: test for in checing vs fast mock

Created: 2 years ago by: Registered User

Jump to the latest result

test for in checing

fast mock

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):