The concat method is missing in bubble sorting: Why do you need to return an empty array when the length of the array is less than or equal to 1?

Analysis of the root cause of the lack of concat method in bubble sorting algorithm

This code attempts to implement bubble sorting using recursion, but the concat method call fails due to a benchmark conditional processing error.

The core logic of the code is to recursively sort arrays. When the length of the array is less than or equal to 1, it should mean that the sorting has been completed, but the code skips and returns directly, resulting in the subsequent concat operation being unable to be executed. The concat method is used to concatenate arrays, in this algorithm, it is responsible for combining sorted sub-numbers into the final result. Since the benchmark condition does not return an array that can be operated by concat , an error is thrown.

The problem is that when the array length is less than or equal to 1, an empty array [] or the original array itself should be returned instead of skipping directly. This ensures that concat method always has an array for joining operations, avoiding errors. The correct benchmark conditions should be: if (arr.length (Return to the original array, which is more in line with the logic of recursion) or <code>if (arr.length (Returning to an empty array, it also ensures the validity of the concat operation).

The modified benchmark conditions ensure that the recursive function can correctly return an array in all cases, thus avoiding the error of missing concat method.

The above is the detailed content of The concat method is missing in bubble sorting: Why do you need to return an empty array when the length of the array is less than or equal to 1?. For more information, please follow other related articles on the PHP Chinese website!