Benchmark: ES6 equivalent to lodash _.mapValues 2132

HTML Preparation code:

<script src="https://raw.githubusercontent.com/lodash/lodash/4.17.15-npm/core.js"></script>

Tests:

native approach with reduce
var fruits= { 'apple': { 'name': 'apple', 'number': 5}, 'orange': { 'name': 'orange', 'number': 10 } }; console.log(Object.entries(fruits) .reduce((a, [key, { number }]) => { a[key] = number; return a; }, {} ));
native approach fromEntries
var fruits= { 'apple': { 'name': 'apple', 'number': 5}, 'orange': { 'name': 'orange', 'number': 10 } }; console.log(Object.fromEntries( Object.entries(fruits).map(([key, { number }]) => [key, number]) ));
lodash mapValues
var fruits= { 'apple': { 'name': 'apple', 'number': 5}, 'orange': { 'name': 'orange', 'number': 10 } }; console.log(_.mapValues(fruits, 'number'))
myFOR
var fruits= { 'apple': { 'name': 'apple', 'number': 5}, 'orange': { 'name': 'orange', 'number': 10 } }; var result = {} for (key in fruits) { result[key] = fruits[key].number } console.log(result)
myFOR2
var fruits= { 'apple': { 'name': 'apple', 'number': 5}, 'orange': { 'name': 'orange', 'number': 10 } }; var result = {} for (key in fruits) { fruits[key] = fruits[key].number } console.log(fruits)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
native approach with reduce
native approach fromEntries
lodash mapValues
myFOR
myFOR2

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 explanation.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark test case, which measures the performance of different approaches to achieve a specific task: transforming an object with nested values from a key-value pair format to an object where each value is mapped to its corresponding key.

**Options Compared**

There are four options compared in this benchmark:

1. **Native Approach with Reduce**: This approach uses the `reduce()` method, which applies a function against an accumulator and each element in the array (in this case, `Object.entries(fruits)`), accumulating a result.
2. **Native Approach fromEntries**: This approach uses the `fromEntries()` method, which creates a new object from an iterable of key-value pairs generated by `Object.entries(fruits)`.
3. **Lodash `mapValues`**: This approach uses the `mapValues()` function from the Lodash library to transform the input object.
4. **Custom Approach with FOR loop (`myFOR` and `myFOR2`)**: These two approaches use a traditional FOR loop to iterate over the key-value pairs of the input object.

**Pros and Cons**

Here's a brief summary of each approach:

1. **Native Approach with Reduce**:
	* Pros: Native JavaScript functions, no external dependencies.
	* Cons: Can be less readable for complex transformations, may not perform as well as native array methods in some cases.
2. **Native Approach fromEntries**:
	* Pros: More concise and expressive than `reduce()`, can be faster due to optimized implementations.
	* Cons: Requires modern JavaScript features (ES6+), may not work in older browsers or environments.
3. **Lodash `mapValues`**:
	* Pros: Convenient, readable, and maintainable, especially for complex transformations.
	* Cons: External dependency on Lodash library, may add overhead due to function call and object creation.
4. **Custom Approach with FOR loop (`myFOR` and `myFOR2`)**:
	* Pros: No external dependencies, straightforward implementation.
	* Cons: Can be verbose and error-prone, may not perform as well as native array methods.

**Library: Lodash**

Lodash is a popular JavaScript library that provides a collection of reusable functions for common tasks, such as array manipulation, object transformation, and utility functions. In this benchmark, the `mapValues()` function from Lodash is used to transform the input object.

**Special JS Feature/Syntax (None)**

There are no special JavaScript features or syntax mentioned in the provided code snippets that would require specific handling or explanations.

**Other Alternatives**

If you want to explore alternative approaches or optimize your own implementation, consider:

* Using `forEach()` or `for...of` loops instead of traditional FOR loops.
* Utilizing modern JavaScript features like `Promise.all()`, `async/await`, or `Web Workers` for parallel processing.
* Leveraging third-party libraries or frameworks that provide optimized array and object manipulation functions (e.g., Ramda, Underscore.js).

Feel free to ask if you have any specific questions about this explanation!

Related benchmarks:

ES6 equivalent to lodash _.mapValues 2132 (version: 0)

Comparing performance of: native approach with reduce vs native approach fromEntries vs lodash mapValues vs myFOR vs myFOR2

Created: 3 years ago by: Guest

Jump to the latest result

native approach with reduce

native approach fromEntries

lodash mapValues

myFOR

myFOR2

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):