how they factorial of ome number in js code example

Example 1: factorial program in javascript

function fact(N){
  if(N <= 1){
  	return "1";
  }
  else
  {
    return N * fact(N-1);  
  }
}

fact(5);

Example 2: javascript factorial of a number

const factorial = n => n <= 1 ? 1 : n * factorial(n - 1);

// Examples
factorial(2);   // 2
factorial(3);   // 6