浮点到字符串转换-JS

Question

So I am currently working on that function

const countSixes = n => {
  if (n === 0) return 0;
  else if (n === 1) return 1;
  else n = (countSixes(n-1) + countSixes(n-2)) / 2;

  return n;
}

And so my question is how to convert the final floating-point value into a string?

Every time after calling the function and trying to convert the float number it returns NaN

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What I've Tried

1. "" + value
2. String(value)
3. value.toString()
4. value.toFixed(2)

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Hope to get the answer

Thank you!

Answer 1

The first option works for me

 <script> const countSixes = n => { if (n === 0) return 0; else if (n === 1) return 1; else n = (countSixes(n-1) + countSixes(n-2)) / 2; return n; } alert(countSixes(12) + "") </script> 

Answer 2

The problem is really interesting. Its return NaN because when you return n as String , as the function is called recursively so it cannot perform arithmetic operations in next level.
It will never end for certain numbers like 55

function countSixes(n,firstTime=true){
        if (n === 0) return 0;
        else if (n === 1) return 1;
        else n = (countSixes(n-1,false) + countSixes(n-2,false)) / 2;
        if(firstTime) return n.toFixed(10);    // return string
        else return parseFloat(n.toFixed(10));      // return float
    }

Answer 3

You could convert the final value to a string with the wanted decimals.

 const countSixes = n => { if (n === 0) return 0; if (n === 1) return 1; return (countSixes(n - 1) + countSixes(n - 2)) / 2; } console.log(countSixes(30).toFixed(15));