Benchmark: isEmptyObject: keys vs for in 2

Script Preparation code:

function keys(obj) {
    if (!obj) {
        return [];
    }
    if (Object.keys) {
        return Object.keys(obj);
    }
    var keyList = [];
    for (var key in obj) {
        if (obj.hasOwnProperty(key)) {
            keyList.push(key);
        }
    }
    return keyList;
}

function isEmptyObj(obj) {
    return !keys(obj).length;
}

function isEmptyObj2(obj) {
    if (!obj) {
        return true;
    }
    for (var key in obj) {
        if (obj.hasOwnProperty(key)) {
            return false;
        }
    }
    return true;
}

var testObj = {
    "siteId": "81ac2a67a958e7aebff3df41ee9797a9",
    "installs": {
        "HWCsI8jkLgwa": {
            "appId": "dvNRF2bh1fgh",
            "scope": {},
            "options": {
                "theme": "without"
            }
        }
    },
    "internal": {
        "placementErrors": []
    }
}

Tests:

keys
isEmptyObj(testObj)
for in
isEmptyObj2(testObj)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
keys
for in

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

The provided JSON represents two benchmark test cases: `isEmptyObject: keys vs for in 2`. This benchmark compares the execution performance of two functions: `keys` and `for in`, which are used to check if an object is empty.

**Test Case 1: `keys` function**

The `keys` function checks if an object is empty by using the `Object.keys()` method. If this method is available, it returns an array of the object's keys; otherwise, it falls back to a manual implementation that iterates over the object's properties.

**Test Case 2: `for in` loop**

The `for in` loop checks if an object is empty by iterating over its properties and checking if any of them have a value (i.e., `obj.hasOwnProperty(key)` returns `true`). If no properties have a value, it assumes the object is empty.

**Options Compared:**

1. **Using `Object.keys()`**: This method is supported by modern browsers and provides a concise way to get an array of keys. However:
	* Pros: Fast, efficient, and widely supported.
	* Cons: May not work in older browsers or environments that don't support `Object.keys()`.
2. **Manual Iteration with `for in`**: This approach iterates over the object's properties manually, which can be slower than using `Object.keys()`.

**Other Considerations:**

* The `keys` function uses a conditional statement to determine whether `Object.keys()` is available. If this method is not supported, it falls back to the manual implementation.
* The `for in` loop uses a similar approach as the manual implementation of the `keys` function.
* Both functions assume that an empty object has no properties.

**Library:**

None

**Special JS Feature/Syntax:**

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

**Other Alternatives:**

1. Using `Object.keys()` with a simple check for its existence, like so:
```javascript
function isEmptyObj(obj) {
  return Object.keys(obj) === null || Object.keys(obj).length === 0;
}
```
2. Using a library like Lodash or Underscore.js to implement the `isEmpty` function.

Note that the benchmark results will depend on the specific browsers and environments used for testing. The latest benchmark result shows that the `for in` loop is slightly faster than the `keys` function, but this may vary depending on the test environment.

Related benchmarks:

isEmptyObject: keys vs for in 2 (version: 0)

Comparing performance of: keys vs for in

Created: 4 years ago by: Guest

Jump to the latest result

keys

for in

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):