# What Is Recursive in Data Structure With Example?

//

Scott Campbell

What Is Recursive in Data Structure With Example?

Recursive is a concept in data structures that involves a function calling itself repeatedly until a certain condition is met. It is a powerful technique that allows solving complex problems by breaking them down into smaller, more manageable subproblems.

## Understanding Recursion

To understand recursion, let’s consider a simple example of calculating the factorial of a number. The factorial of a non-negative integer n, denoted as n!, is the product of all positive integers less than or equal to n.

For instance, 5! = 5 * 4 * 3 * 2 * 1 = 120.

To calculate the factorial using recursion, we can define a function that calls itself with smaller values until it reaches the base case where n equals 1. Here’s how it can be implemented in JavaScript:

```function factorial(n) {
// Base case
if (n === 1) {
return 1;
}

// Recursive call
return n * factorial(n - 1);
}
```

Let’s break down the recursive implementation step by step:

### Base Case

• We start by checking if the input value (n) equals 1.
• If it does, we return 1 as there are no more subproblems to solve.

### Recursive Call

• If the base case is not met, we make a recursive call to the same function with n – 1 as the argument.
• This recursive call breaks down the problem into smaller subproblems.

### Returning Result

• The result from each recursive call is multiplied by n and returned back up through the call stack.
• Once the base case is reached, the final result is obtained by multiplying all the intermediate results.

By using recursion, we can solve complex problems by dividing them into simpler subproblems. However, it’s important to note that recursive solutions can be less efficient than iterative ones in certain cases. Recursive functions rely on function calls and maintaining a call stack, which incurs additional overhead.

In conclusion, recursion is a powerful technique in data structures that allows solving complex problems by breaking them down into smaller subproblems. It offers a more intuitive and elegant approach to problem-solving in some scenarios. However, it’s crucial to understand the base case and ensure termination conditions are met to avoid infinite loops.

I hope this article has provided you with a clear understanding of what recursion is in data structures and how it can be implemented with an example. Keep exploring and experimenting with recursion to enhance your problem-solving skills!