recursion js

1function recurse(arr=[])
2{
3  	// base case, to break the recursion when the array is empty
4    if (arr.length === 0) {
5    	return;
6    }
7  	
8  	// destructure the array
9	const [x, ...y] = arr;
10  
11  	// Do something to x
12  	
13  	return recurse(y);
14}

1// program to count down numbers to 1
2function countDown(number) {
3
4    // display the number
5    console.log(number);
6
7    // decrease the number value
8    const newNumber = number - 1;
9
10    // base case
11    if (newNumber > 0) {
12        countDown(newNumber);
13    }
14}
15
16countDown(4);

1var countdown = function(value) {
2    if (value > 0) {
3        console.log(value);
4        return countdown(value - 1);
5    } else {
6        return value;
7    }
8};
9countdown(10);