var array1 = Array(400).fill().map(() => Math.round(Math.random() * 40));var array2 = Array(400).fill().map(() => Math.round(Math.random() * 40));var array3 = Array(400).fill().map(() => Math.round(Math.random() * 40));var array4 = Array(400).fill().map(() => Math.round(Math.random() * 40));var array5 = Array(400).fill().map(() => Math.round(Math.random() * 40));var allArrays = [array1, array2, array3, array4, array5];var others = [].concat.apply([], allArrays);var others = allArrays.flat()--enable-precise-memory-info flag.
| Test case name | Result |
|---|---|
| concat.apply | |
| flat |
| Test name | Executions per second |
|---|---|
| concat.apply | 1479548.5 Ops/sec |
| flat | 7156.7 Ops/sec |
Let's break down the provided JSON data and explain what is being tested, compared, and the pros/cons of different approaches.
Benchmark Definition:
The benchmark measures two approaches for concatenating arrays:
Array.prototype.concat.apply: This method applies the concat function to an array-like object using the apply method..flat(): This method returns a new array with all subarrays nested at the same level as the original array.Script Preparation Code:
The script generates five arrays of 400 elements each, filled with random integers between 0 and 40. These arrays are stored in variables array1 to array5. The allArrays variable is an array containing these five arrays.
Html Preparation Code:
This field is empty, indicating that no HTML preparation code is required for this benchmark.
Individual Test Cases:
There are two test cases:
concat.apply method to concatenate all five arrays into a single array using the allArrays variable..flat() method to concatenate all five arrays into a single array.Pros and Cons:
apply method's overhead..flat(): Library Usage:
The concat.apply method uses the built-in Array.prototype.concat() function, which is a part of the JavaScript standard library. The .flat() method uses the native Array.prototype.flat() function, also part of the JavaScript standard library.
Special JS Features/Syntax:
None mentioned in this benchmark definition.
Other Alternatives:
If you're looking for alternative approaches to concatenating arrays, consider using:
.reduce(): This method can be used to concatenate arrays by reducing them into a single array.Array.prototype.reduceRight()``: Similar to .reduce()`, but starts from the right end of the array..concat() and array.push(): Concatenating arrays using the push() method, followed by concatenating the resulting arrays.Keep in mind that these alternatives may have different performance characteristics or requirements for specific use cases.
