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Write result into csv file in nodeJS


By : user2174882
Date : October 16 2020, 08:10 PM
around this issue If you just add append: true to your createCsvWriter call argument, it would somewhat work, though the order of CSV records depends on the order splashy.fromUrl finishes its work. Also, because you use append mode, you won't get the header record in the output CSV.
Instead, you can define csvWriter outside of your imgs loop.
code :
const csvWriter = createCsvWriter({
  path: "./data/output.csv",
  header: [
    { id: "url", title: "URl" },
    { id: "color1", title: "Color" },
    { id: "color2", title: "Color" },
    { id: "color3", title: "Color" }
  ]
});

const promiseForRecords = imgs.map(async img => {
  const colors = await splashy.fromUrl(img.toString());
  return {
    url: img,
    color1: colors[0],
    color2: colors[1],
    color3: colors[2]
  };
});

Promise.all(promiseForRecords)
  .then(records => csvWriter.writeRecords(records))
imgs.reduce(async (promise, img) => {
  await promise;

  const colors = await splashy.fromUrl(img.toString());
  const records = [
    {
      url: img,
      color1: colors[0],
      color2: colors[1],
      color3: colors[2]
    }
  ];
  return csvWriter.writeRecords(records);
}, Promise.resolve());


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i'm using write() to write the results into a file but it does not contain the result of last loop


By : Sergey
Date : March 29 2020, 07:55 AM
This might help you Ashwini Chaudhary's solution is a lot better, consider my answer just as a backgrounder on what went wrong and why it went wrong, and the difference between opening/closing files inside or outside the loop.
File opens and closes should be paired, like here, the file is repeatedly opened, written and closed inside the loop:
code :
for a in range(3):
    result = 'abcd' + a
    opener = open('file.txt', "a")
    print results
    opener.write(results)
    opener.close()
opener = open('file.txt', "a")
for a in range(3):
    result = 'abcd' + a
    print results
    opener.write(results)
opener.close()
opener = open('file.txt', "a")
for a in range(3):
    result = 'abcd' + a
    print results
    opener.write(results)
    opener.flush()
opener.close() 

NodeJs: can't write a file


By : Marcel Kulodrb
Date : March 29 2020, 07:55 AM
will be helpful for those in need I really recommend that you use JSON.parse. It will parse your json and put it into a variable you can use:
code :
fs.readFile('test.json', 'utf8', function (err,data) {  
    data = JSON.parse(data); // Yay you can use anything from the JSON
}

nodejs read file, write to temporary file then copy and replace the original file


By : Kristin
Date : March 29 2020, 07:55 AM
like below fixes the issue I'm not sure I followed all that you were trying to do from that short code snippet, but it's possible that you could get into some trouble mixing asynchronous file reading and synchronous file writing like that.
If those two line ran one after the other as you have them written, the second readFile wouldn't see the output created by the writeFileSync that's above it -- the tmpPath file wouldn't have been written to yet.

Cant write to file NodeJS


By : user1506081
Date : March 29 2020, 07:55 AM
should help you out As the comment by @Heretic clearly mentions that the writeFile does not return the Promise object by default.
You can look at util library to promisify your functions if you are using latest versions of Node
code :
function makeDirectory(path) {
    return new Promise((resolve, reject) => {
        mkdirp(path, function(err) {
            if (err) return reject(err);
            return resolve();
        }); 
    })
};
function saveFile(path, content) {
    return new Promise((resolve, reject) => {
        fs.writeFile(path, content, (err) => {
            if (err) return reject(err);
            return resolve();
        });
    })
};

How to write result of each sliding window of a FLINK program in new file Instead of appending the result of all Windows


By : saket_bhushan
Date : March 29 2020, 07:55 AM
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