Benchmark: lodash hasIn vs custom hasIn

HTML Preparation code:

<script scr="https://cdn.jsdelivr.net/npm/lodash@4.17.10/lodash.min.js"></script>

Script Preparation code:

function hasIn(object, path) {
  if (path in object) {
    return true;
  }

  let ret = false;
  path = path.split('.');
  if (path.length > 1) {
    let obj = object;
    for (const prop of path) {
      ret = prop in obj;
      if (!ret) {
        break;
      }
      obj = obj[prop];
    }
  }
  return ret;
}

var testObject = {
	a: {
    	b: 1,
    },
}

Tests:

lodash hasIn
_.hasIn(testObject, 'a.b')
custom hasIn
hasIn(testObject, 'a.b')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash hasIn
custom hasIn

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.

Let's break down the provided benchmark and explain what's being tested, compared, and analyzed.

**Benchmark Overview**

The benchmark is designed to compare the performance of two approaches: using Lodash's `_.hasIn()` function versus implementing a custom `hasIn()` function. The test object is defined as `testObject` with nested properties (`a.b`). The benchmark runs these two tests on both individual property accesses (`'a.b'`) and nested object traversals (`'a.b.c'`).

**Test Cases**

There are two test cases:

1. **Lodash hasIn**: This test case uses Lodash's `_.hasIn()` function to check if a key exists in the object.
2. **Custom hasIn**: This test case implements a custom `hasIn()` function to check if a key exists in the object.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides a wide range of functions for various tasks, including string manipulation, array and object manipulation, and more. In this benchmark, Lodash's `_.hasIn()` function is used to check if a key exists in an object.

The custom implementation of `hasIn()` function is not provided in the benchmark code, but it seems to be similar to the one shown in the Script Preparation Code section.

**Custom hasIn Function**

The custom `hasIn()` function checks if a key exists in an object by:

1. Checking if the key exists directly in the object.
2. If not, splitting the path into individual properties and recursively traversing the object using a loop.

This implementation has some pros and cons:

Pros:

* Custom implementation allows for fine-grained control over the traversal logic.
* Can be optimized for specific use cases.

Cons:

* May be less efficient than Lodash's implementation due to the recursive nature of the custom function.
* Requires additional maintenance and updates when changes are made to the test object or the `hasIn()` function.

**Comparison**

The benchmark compares the performance of the two approaches: Lodash's `_.hasIn()` function versus the custom implementation. The results show that:

* The custom `hasIn()` function performs better than Lodash's implementation in terms of executions per second, indicating faster execution times.
* However, it's essential to consider other factors such as code readability, maintainability, and overhead introduced by the custom implementation.

**Other Alternatives**

Other alternatives for implementing a hasIn-like function include:

* Using `in` operator with bracket notation (`'object.property' in object`)
* Utilizing libraries like `js-micro-optimization` or `fastest-has`
* Implementing a recursive traversal using a stack data structure

However, it's worth noting that Lodash's implementation is generally considered the most efficient and reliable way to check if a key exists in an object.

In summary, the benchmark highlights the importance of considering performance, readability, and maintainability when implementing custom functions versus leveraging existing libraries like Lodash.

Related benchmarks:

lodash hasIn vs custom hasIn (version: 0)

Comparing performance of: lodash hasIn vs custom hasIn

Created: 3 years ago by: Guest

Jump to the latest result

lodash hasIn

custom hasIn

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):