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# Recursion

Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is called a recursive call of the function.

Lets see an example of recursive code in JavaScript.

`function recurse() { // function code recurse(); // function code}recurse();`

Here, the `recurse() `function is a recursive function. It is calling itself inside the function.

`                   `

While using recursion, one need to be careful to define an exit condition from the function, otherwise it will go into an infinite loop.

`function fun() { if(condition) { fun(); } else { // stop calling fun() //code return; }}fun();`

Recursive functions are very useful to solve many mathematical problems.

Try the following example in the editor below.

Given an input number A, find Ath fibonacci number.

`fib0 = 0fib1 = 1fibi = fibi-2 + fibi-1  (i > 1)`

Sample Input

`3 `

Sample Output

`2`
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