Benchmark: merge empty obj vs $.isEmptyObj check

HTML Preparation code:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>

Tests:

merge empty obj
const o = test(); function test() { const emptyObj = {}; const obj = { one: 1, two: 2 }; return { ...obj, ...emptyObj }; }
$.isEmptyObj check
const o = test(); function test() { const emptyObj = {}; const obj = { one: 1, two: 2 }; if($.isEmptyObject(emptyObj)) { return obj; } else { return { ...obj, ...emptyObj }; } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
merge empty obj
$.isEmptyObj check

Fastest: N/A

Slowest: N/A

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

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**Overview of the Benchmark**

The provided benchmark measures the performance difference between two approaches for merging an object with an empty object in JavaScript.

**Approaches Compared:**

1. **Spread Operator (`...`) Approach**: This approach uses the spread operator to merge the properties of `obj` with an empty object, effectively ignoring any duplicate keys.
2. **$.isEmptyObject check Approach**: This approach uses the jQuery library's `$isEmptyObject` function to check if the `emptyObj` is empty before merging it with `obj`. If `emptyObj` is empty, only `obj` is returned.

**Pros and Cons of Each Approach:**

1. **Spread Operator (`...`) Approach**:
	* Pros: Concise, efficient, and modern way to merge objects.
	* Cons: May not be supported in older browsers or environments that don't have ES6+ syntax support.
2. **$.isEmptyObject check Approach**:
	* Pros: More readable and maintainable for developers familiar with jQuery.
	* Cons: Adds overhead due to the use of an external library, which may slow down execution.

**Library Used:**

The benchmark uses the jQuery library (`https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js`) for the `$isEmptyObject` function.

**Special JS Feature/Syntax:**

None mentioned in this benchmark. However, it's worth noting that modern JavaScript engines like V8 (used by Chrome) support the spread operator (`...`) since ES6+ syntax.

**Other Alternatives:**

If you need to merge objects without using the spread operator or jQuery library:

1. **Using a simple loop**: You can use a simple loop to iterate through the properties of `obj` and append them to an empty object.
2. **Using the `Object.assign()` method**: This method merges all enumerable own properties of source objects into a target object.

Example code using a simple loop:
```javascript
function mergeEmptyObj(obj, emptyObj) {
  for (const key in obj) {
    if (!emptyObj.hasOwnProperty(key)) {
      emptyObj[key] = obj[key];
    }
  }
  return emptyObj;
}
```
Example code using `Object.assign()`:
```javascript
function mergeEmptyObj(obj, emptyObj) {
  return Object.assign({}, obj, emptyObj);
}
```

Related benchmarks:

merge empty obj vs $.isEmptyObj check (version: 0)

Comparing performance of: merge empty obj vs $.isEmptyObj check

Created: 6 years ago by: Guest

Jump to the latest result

merge empty obj

$.isEmptyObj 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):