php reccursion in javascript

Recursion in JavaScript works similarly to recursion in PHP. Here's an example of a PHP function that calculates the factorial of a given number using recursion:

main.php
function factorial($n) {
  if ($n === 0) {
    return 1; 
  } else {
    return $n * factorial($n-1);
  }
}
108 chars
8 lines

Now, let's write the same function in JavaScript:

index.tsx
function factorial(n) {
  if (n === 0) {
    return 1; 
  } else {
    return n * factorial(n-1);
  }
}
104 chars
8 lines

This function takes a number n as an argument, and returns the factorial of that number. If n is 0, the function returns 1. Otherwise, it multiplies n by the factorial of n-1. This process continues until n is 0, at which point the function returns 1 to end the recursion.

Recursion can be a powerful tool for solving complex problems and performing operations on data structures. It's important to keep in mind that recursive functions can be computationally expensive, so it's important to optimize your code and make sure it doesn't get stuck in an infinite loop.