function calling itself code example

Example 1: recursion

/*Java*/
static void recursion(){ recursion(0); }
static void recursion(int x){
	System.out.println("eheh " + x);
    if(x != 666) recursion(x+1);
}

Example 2: javascript recursion over array

function recurse(arr=[])
{
  	// base case, to break the recursion when the array is empty
    if (arr.length === 0) {
    	return;
    }
  	
  	// destructure the array
	const [x, ...y] = arr;
  
  	// Do something to x
  	
  	return recurse(y);
}