Reverse array using recursion
In computer programming, recursion is a technique in which a function calls itself repeatedly until a base condition is reached. In this article, we will explore how to use recursion to reverse an array in a simple and concise way.
To reverse an array using recursion, we can start by defining a function that takes an array and two indices as its arguments. The first index, i, will start at the beginning of the array, and the second index, j, will start at the end of the array.
We can then swap the elements at the ith and jth indices of the array, and recursively call the function with the ith index incremented and the jth index decremented. We repeat this process until i is greater than or equal to j, which means we have reversed the entire array.
Here's an example implementation of the reverseArray function in JavaScript:
function reverseArray(arr, i, j)
{
if (i >= j)
{
return;
}
let temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
reverseArray(arr, i + 1, j  1);
}
const arr = [1, 2, 3, 4, 5];
reverseArray(arr, 0, arr.length  1);
console.log(arr); // Output: [5, 4, 3, 2, 1]
In this implementation, we start by calling the reverseArray function with the array, arr, the first index, 0, and the last index, arr.length  1.
The function checks if i is greater than or equal to j. If it is, we have reversed the entire array and we return. If not, we swap the elements at the ith and jth indices of the array and recursively call the function with the ith index incremented and the jth index decremented.
We repeat this process until i is greater than or equal to j, at which point we have reversed the entire array.
Recursion can be a powerful technique in programming, allowing us to solve complex problems with elegant and concise code. In this article, we have explored how to use recursion to reverse an array in a simple and intuitive way.
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