JAVASCRIPT

recursion javascript

function countDown(fromNumber) {
    console.log(fromNumber);

    let nextNumber = fromNumber - 1;

    if (nextNumber > 0) {
        countDown(nextNumber);
    }
}
countDown(3);
Code language: JavaScript (javascript)

recursive function javascript

/*
Recursion is when a function calls itself until someone stops it. 
If no one stops it then it'll recurse (call itself) forever.
*/

// program to count down numbers to 1
function countDown(number) {
    // display the number
    console.log(number);
    // decrease the number value
    const newNumber = number - 1;
    // base case
    if (newNumber > 0) {
        countDown(newNumber);
    }
}

countDown(4);
// Out put: 
4
3
2
1

Recursion In DOM

function walkTree(node) {
  if (node == null) //
    return;
  // do something with node
  for (var i = 0; i < node.childNodes.length; i++) {
    walkTree(node.childNodes[i]);
  }
}

recursive function

>>> def sum_digits(n):
        """Return the sum of the digits of positive integer n."""
        if n < 10:
            return n
        else:
            all_but_last, last = n // 10, n % 10
            return sum_digits(all_but_last) + last

Recursive function

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