Float to String Conversion - 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

What I've Tried

"" + value
String(value)
value.toString()
value.toFixed(2)

Hope to get the answer

Thank you!

I copied your function exactly as posted, ran it in the chrome console and added a toString() at the end of the call and got a string output, what value are you calling this function with? — tt9
– tt9, Commented Jan 29, 2019 at 18:47
Each of those should work , can you give a larger example and explain what you want and what happens instead? — Robin Zigmond
– Robin Zigmond, Commented Jan 29, 2019 at 18:48
Issue is you are using it in recursive manner so you probably were using inside the function call so you were subtracting strings? Hard to tell since you did not show how you were converting it to a string. — epascarello
– epascarello, Commented Jan 29, 2019 at 18:54

ByJ Fornes · Accepted Answer · 2019-01-29 18:51:09Z

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>

answered Jan 29, 2019 at 18:51

ByJ Fornes

234 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Maheer Ali · Accepted Answer · 2019-01-29 19:20:48Z

1

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
    }

answered Jan 29, 2019 at 19:20

Maheer Ali

36.5k8 gold badges53 silver badges83 bronze badges

2 Comments

Wiimm Over a year ago

I would define countSixes() as entry and countSixesHelper() as recursive part.

Maheer Ali Over a year ago

I would also do that but i posted this in hurry

Nina Scholz · Accepted Answer · 2019-01-29 18:52:00Z

0

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));

answered Jan 29, 2019 at 18:52

Nina Scholz

388k26 gold badges367 silver badges417 bronze badges

Collectives™ on Stack Overflow

Float to String Conversion - JS

What I've Tried

3 Answers 3

Comments

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

What I've Tried

3 Answers 3

Comments

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related