var params = [[ 1, 2 ], [ "hello", true, 7 ]];
var other = params.reduce((acc, val) => acc.concat(val), []);
var params = [[1, 2, params], [ "hello", true, 7 ]];
var other = params.flat(1);
const flat = (array, depth) => ((Number(depth) > 1) ?
array.flat(depth) :
array.reduce((a, v) => a.concat(v), []));
var params = [[1, 2, params], [ "hello", true, 7 ]];
var other = flat(params);
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
reduce + Array.prototype.concat | |
Array.prototype.flat | |
Custom flat |
Test name | Executions per second |
---|---|
reduce + Array.prototype.concat | 2893541.0 Ops/sec |
Array.prototype.flat | 590489.2 Ops/sec |
Custom flat | 1750057.5 Ops/sec |
Let's dive into the world of JavaScript microbenchmarks!
Benchmark Definition
The provided JSON represents a benchmark definition for measuring the performance of different approaches to flatten an array in JavaScript. The benchmark is designed to compare three methods:
Array.prototype.concat()
: The traditional way to concatenate arrays.Array.prototype.flat(1)
: A new ES6 spread operator method introduced in ECMAScript 2019, which flattens an array of arrays into a one-dimensional array.flat()
function): A custom flat function implemented by the user.Options Compared
The benchmark compares the performance of these three approaches on two test cases:
reduce + Array.prototype.concat
(using the traditional concat()
method)Array.prototype.flat
(using the ES6 spread operator)flat()
function)Pros and Cons of Each Approach
Here's a brief analysis of each approach:
concat()
: This is a simple, well-established method for concatenating arrays. However, it can be slow for large arrays due to the overhead of creating new arrays.Array.prototype.flat(1)
: The ES6 spread operator provides a more efficient way to flatten arrays by using lazy evaluation and avoiding unnecessary array creations.flat()
implementation: This approach provides the most control over the flattening process but requires more code and may be slower due to additional overhead.Test Case 2: Array.prototype.flat()
This test case uses the ES6 spread operator method to flatten an array of arrays. This approach is designed to be efficient and modern.
Test Case 3: Custom flat()
implementation
This test case implements a custom flat function to demonstrate its potential performance and control over the flattening process.
Other Considerations
Alternatives
If you're interested in exploring alternative methods for flattening arrays, consider:
Array.prototype.map()
and Array.prototype.reduce()
together to achieve a similar result.Keep in mind that each alternative has its own trade-offs in terms of performance, readability, and maintainability.