Question

63

Recursive async function in JavaScript

rated 0 times [ 70] [ 7] / answers: 1 / hits: 29994 / 7 Years ago, fri, september 15, 2017, 12:00:00

I'm trying to write a recursive function using async/await in JavaScript.
This is my code:

async function recursion(value) {

  return new Promise((fulfil, reject) => {

    setTimeout(()=> {

      if(value == 1) {

        fulfil(1)

      } else {

        let rec_value = await recursion(value-1)

        fulfil(value + rec_value)

      }

    }, 1000)

    })

}



console.log(await recursion(3))

But I have syntax error:

let rec_value = await recursion(value-1)

                              ^^^^^^^^^



SyntaxError: Unexpected identifier

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nikoguym

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2 Years ago

answered 7 Years ago amari · Accepted Answer

I'd write your code as follows:

const timeout = ms => new Promise(resolve => setTimeout(resolve, ms));



async function recursion(value) {

  if (value === 0) return 0;



  await timeout(1000);

  return value + await recursion(value - 1);

}



(async () => console.log(await recursion(3)))();