✅ – BIOLOGY SCIENCE – 11-02 Jul 28

this is my code

const fs = require('fs');
const x = [1, 2, 3 ...]; // array consisting of numbers
const temp = []; // empty array

x.forEach((item) =>
{
  fx(item).then((promiseData) =>
  {  // fx is a function returning a promise

    fs.writeFileSync('path/to.file', promiseData);

    if ( (item / 2).toString().includes('.') ) {
      temp.push(item);
    }

  });
});

fs.writeFileSync('path/to/differnet.file', JSON.stringify(temp, null, 4));

const fs = require('fs');
const x = [1, 2, 3 ...]; // array consisting of numbers
const temp = []; // empty array

x.forEach((item) =>
{
  fx(item).then((promiseData) =>
  {  // fx is a function returning a promise

    fs.writeFileSync('path/to.file', promiseData);

    if ( (item / 2).toString().includes('.') ) {
      temp.push(item);
    }

  });
});

fs.writeFileSync('path/to/differnet.file', JSON.stringify(temp, null, 4));

for some reason the content of path/to/different.file is just an empty array i have tried logging the temp array after the forEach loop, it is not empty, but when i try to write the file, it doesnt work properly any fixes ?

3 Replies

ScriptyChris•3y ago

forEach is unaware of async code inside You should rather use Promise.all + array.map() Something like that

const temp = await Promise.all(
  x.map((item) => {
    return fx(item)
      .then((promiseData) => {  // fx is a function returning a promise
        fs.writeFileSync('path/to.file', promiseData);

        if ( (item / 2).toString().includes('.') ) {
          return item;
        }
      });
  })
);

const temp = await Promise.all(
  x.map((item) => {
    return fx(item)
      .then((promiseData) => {  // fx is a function returning a promise
        fs.writeFileSync('path/to.file', promiseData);

        if ( (item / 2).toString().includes('.') ) {
          return item;
        }
      });
  })
);

RelativPerspektiv•3y ago

Ohok I'll give it a try awesome, it works thank you

reactibot•3y ago

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