Benchmark: Object size vs _.size

HTML Preparation code:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.core.js"></script>

Script Preparation code:


Object.size = function(obj) {
    var size = 0, key;
    for (key in obj) {
        if (obj.hasOwnProperty(key)) size++;
    }
    return size;
};

Tests:

Object size
var a = {a:1,b:2,c:3,d:4}; var size = Object.size(a);
_.size
var a = {a:1,b:2,c:3,d:4}; var size = _.size(a);
Object keys size
var a = {a:1,b:2,c:3,d:4}; var size = Object.keys(a).length;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object size
_.size
Object keys size

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 dive into the world of JavaScript microbenchmarks and explain what's being tested in this specific benchmark.

**Benchmark Definition**

The benchmark is defined as an object with several properties:

* `Name`: A descriptive name for the benchmark, which is "Object size vs _.size" in this case.
* `Description`: A brief explanation of what the benchmark is testing. In this case, it's comparing the performance of two methods: the new ES6 spread operator (`...`) and the traditional concatenation method using `concat()`.
* `Script Preparation Code`: A code snippet that sets up a custom function called `Object.size` to measure the size of an object. This function is not a part of the standard JavaScript library, but rather a custom implementation.
* `Html Preparation Code`: An HTML link to include the Lodash library (`lodash.core.js`) in the test environment.

**Individual Test Cases**

There are three test cases:

1. **Object size**: Measures the performance of the `Object.size` function with an object containing four properties (`a:1`, `b:2`, `c:3`, and `d:4`).
2. **_.size**: Measures the performance of the `_.size` function from the Lodash library, which is a popular utility library for functional programming tasks.
3. **Object keys size**: Measures the performance of using the `length` property to get the number of keys in an object.

**Library Used**

The benchmark uses the Lodash library, which is a JavaScript utility library that provides various functions for working with arrays, objects, and more. The `_size` function from Lodash is used to measure the size of an object.

**Special JS Feature or Syntax**

There isn't any special JavaScript feature or syntax being tested in this benchmark.

**Pros and Cons of Approaches**

1. **Using `Object.size`**: This custom implementation is likely to be faster than using a standard method like `_.size`, since it avoids the overhead of a library function call.
	* Pros: Faster execution, potentially more efficient use of resources.
	* Cons: May not work with all object types or versions of JavaScript, and requires custom implementation.
2. **Using `_.size`**: This approach uses a well-established utility function from a reputable library (Lodash).
	* Pros: Widely tested and supported, less maintenance required.
	* Cons: Potential performance overhead due to the library function call.

**Other Alternatives**

If you want to implement your own size calculation without using a custom `Object.size` function, you could use other methods like:

* Using `Object.keys()` and `length`: This approach is similar to the third test case but may be slower due to the overhead of creating an array of keys.
* Using a simple loop: You can write a simple loop to iterate over the object's properties and increment a counter.

Here's a possible implementation using a simple loop:
```javascript
Object.size = function(obj) {
  var size = 0;
  for (var key in obj) {
    if (obj.hasOwnProperty(key)) size++;
  }
  return size;
};
```
Keep in mind that this approach may not be as efficient or scalable as the custom `Object.size` implementation.

Related benchmarks:

Object size vs _.size (version: 1)

Compare the new ES6 spread operator with the traditional concat() method

Comparing performance of: Object size vs _.size vs Object keys size

Created: 8 years ago by: Registered User

Jump to the latest result

Object size

_.size

Object keys size

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):