如何在 Node.js 中的异步 function 之外使用变量？

Question

I am trying to use the variable bida elsewhere in my code. For example, when I try to create the variable mida . Is there a way to do that without nesting everything inside the getFX() function? I understand it's an async function issue but how can I get around it?

const fetch = require("node-fetch");

async function getFX() {

let bida;

  try {

    var req = await fetch('https://economia.awesomeapi.com.br/all/USD-BRL');
    var response = await req.json()


   bida = await response.USD.bid;
   aska = await response.USD.ask;

    console.log(bida, aska)

  } catch (e) {
    // handle error
    console.error(e)
  }
}

getFX()

var mida = bida + 1;

console.log (mida);

Answer 1

you should initialize the bida variable outside of the getFX() function to be able to access it elsewhere in that file, and also set the value of mira variable only when getFX resolves using.then() to be able to use the value of bida because getFX is an async function. Here is how I did it:

const fetch = require("node-fetch");

let bida;

async function getFX() {


    try {

       var req = await fetch('https://economia.awesomeapi.com.br/all/USD-BRL');
       var response = await req.json()


       bida = await response.USD.bid;
       aska = await response.USD.ask;

       console.log(bida, aska)

    } catch (e) {
        // handle error
        console.error(e)
    }
}


getFX().then(() => {
    var mida = bida + 1;
    console.log (mida);
})

Hope it helps !