It is not sarcasm. Yes, they love working with me, they learn new things from me and they use it. Generally their face is like "o_O I wish I've learned it before". I use build-in functions of PHP and Java in way without loops, there is nothing unknown. I don't write Erlang code. Here is an example what I mean;

  <?php declare(strict_types=1);
  function fibonacci_nth(int $n): int {
      if($n === 0) return 0;
      if($n === 1) return 1;
      else return fibonacci_nth($n - 2) + fibonacci_nth($n - 1);
  }
  function fibonacci_series(int $n): array {
      return array_map('fibonacci_nth', range(0, $n));
  }

And here in Python

  class Fibonacci:
     def fibonacci_nth(self, n):
        if(n == 0): return 0
        if(n == 1): return 1
        else: return self.fibonacci_nth(n-1) + self.fibonacci_nth(n-2)
        
     def fibonacci_series(self, n):
        return [self.fibonacci_nth(x) for x in range(n+1)]