function flatten(arr) {
let i = 0;
const len = arr.length;
const result = [];
let item;
while (i < len) {
item = Array.isArray(arr[i]) ? flatten(arr[i]) : [arr[i]];
[].push.apply(result, item);
i += 1;
}
return result;
}
var params = [ "hello", true, 7 ];
var other = flatten([1, 2, params]);
var params = [ "hello", true, 7 ];
var other = [1, 2, params].flat()
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Custom Flatten Function | |
Array.prototype.flat |
Test name | Executions per second |
---|---|
Custom Flatten Function | 849704.4 Ops/sec |
Array.prototype.flat | 1040658.2 Ops/sec |
Benchmark Overview
The provided benchmark, Custom flatten function VS Array.prototype.flat
, compares the performance of two approaches for flattening arrays in JavaScript: a custom implementation using a recursive function (flatten
) and the built-in Array.prototype.flat()
method.
Tested Options
Two options are compared:
flatten
that takes an array as input and returns a flattened array.Pros and Cons of Each Approach
Custom Flatten Function:
Pros:
Cons:
Array.prototype.flat():
Pros:
Cons:
Library Considerations
In the provided benchmark, there is no explicit mention of any external libraries. However, it's essential to note that both options rely on built-in JavaScript features: Array.prototype.flat()
uses the ECMAScript 2019 (ES2019) standard for array flattening, while the custom implementation may use older JavaScript versions or workarounds.
Special JS Features
The benchmark uses ES2019's flat()
method, which is a relatively recent feature. The custom implementation might not be compatible with older browsers or environments that don't support this feature. If you need to support older browsers, consider using a polyfill or adapting the custom implementation for compatibility.
Other Alternatives
If you're looking for alternative approaches, here are a few options:
reduce()
to flatten arrays, although it might be less efficient than flat()
due to its overhead.forEach()
in conjunction with Array.prototype.push()
, but this approach can lead to performance issues and is generally not recommended.In conclusion, the benchmark provides a straightforward comparison of two approaches for flattening arrays in JavaScript. The custom implementation requires manual effort but offers more control over the process, while Array.prototype.flat()
is built-in and optimized for performance.