Benchmark: lodash flatmap 2

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js'></script>

Script Preparation code:

var x = [1,2,3]

Array.prototype.flatMap = function(f) {
  return [].concat(...this.map(f))
}

Tests:

lodash.flatMap
_.flatMap(x,x => [x-1, x, x+1])
native
x.flatMap(x => [x-1, x, x+1])

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash.flatMap
native

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 definition and test cases to understand what is being tested.

**Benchmark Definition Json:**

The provided json represents a JavaScript microbenchmark for testing the performance of two approaches:

1.  Using the `flatMap` function from the Lodash library (version 4.17.21).
2.  Implementing the `flatMap` function natively, without using any external libraries.

**Script Preparation Code:**
```javascript
var x = [1,2,3]
Array.prototype.flatMap = function(f) {
    return [].concat(...this.map(f))
}
```
This code defines a simple array `x` and implements the `flatMap` function on the `Array.prototype`. The native implementation uses the spread operator (`...`) to flatten the inner arrays.

**Html Preparation Code:**
```html
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js'></script>
```
This code loads the Lodash library, which provides a `flatMap` function.

**Individual Test Cases:**

There are two test cases:

1.  **lodash.flatMap**
    *   Benchmark Definition: `_.flatMap(x,x => [x-1, x, x+1])`
    *   This test case measures the performance of using the Lodash `flatMap` function with a specific callback function.
2.  **native**
    *   Benchmark Definition: `x.flatMap(x => [x-1, x, x+1])`
    *   This test case measures the performance of implementing the `flatMap` function natively.

**Pros and Cons of Different Approaches:**

*   **Native Implementation:**

Pros:
    -   No dependency on external libraries.
    -   Potential for better optimization since it's implemented in JavaScript.

Cons:
    -   Requires manual implementation, which can be error-prone.
    -   Might not work as expected across all browsers and environments.
*   **Lodash Implementation:**

Pros:
    -   Leverages a well-tested and widely-used library.
    -   Reduces the risk of errors since it's implemented by someone else.

Cons:
    -   Adds an external dependency, which can affect performance.
    -   Might not be optimized for specific use cases.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides various functions for array manipulation, string manipulation, and more. In this benchmark, it's used to implement the `flatMap` function.

The `flatMap` function in Lodash takes an iterable (like an array) as its first argument and a callback function as its second argument. It applies the callback function to each element of the iterable and returns a new array with the results. This is equivalent to using the native implementation's spread operator (`...`) and `map()` methods.

**Special JS Feature or Syntax:**

None mentioned in this benchmark definition.

**Other Considerations:**

When measuring performance, it's essential to consider factors such as:

*   **Browser Support:** Different browsers might have varying levels of support for specific features or libraries.
*   **Platform:** Performance can vary depending on the platform (e.g., desktop vs. mobile).
*   **Execution Count:** The number of executions per second is a good metric, but it doesn't provide context about what that means in terms of actual performance impact.

**Alternatives:**

Other alternatives for testing JavaScript performance could include:

*   Using a different library or framework (e.g., React, Angular).
*   Implementing algorithms from scratch.
*   Comparing the performance of different versions of JavaScript engines (e.g., V8, SpiderMonkey).

Related benchmarks:

lodash flatmap 2 (version: 0)

Comparing performance of: lodash.flatMap vs native

Created: 4 years ago by: Guest

Jump to the latest result

lodash.flatMap

native

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):