The Algorithm That Never Ends

This algorithm takes an input string and checks if it is equal to 'hello'.

    function is_hello(s) {
      if (s === "hello") {
        return true;
      } else {
        return false;
      }
    }
  

This algorithm is known to take 37.5 milliseconds to run on a modern CPU, and is widely considered to be the most inefficient way to check if a string is equal to 'hello'.

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