how can I run my functions be sequentially

Question

function Getir() {
    var options =
    {
        host: 'example',
        port: 443,
        path: '/myUrl'
    };

    get(options, function (http_res) {
        var data = "";


        http_res.on("data", function (chunk) {

            data += chunk;
        });

        
        http_res.on("end", function () {
            
            writeFile('NewHtml.txt', `${data}`, 'utf8', (err) => {
                if (err) console.log(err);
            });
        });
    });
}


function DegistirDuzenle() {
    if (existsSync("./DatabaseHtml.txt")) {

        var DataBaseHtml = readFileSync("./DatabaseHtml.txt", 'utf-8', (err) => { if (err) console.log(err) });
        var MyHtml = readFileSync("./NewHtml.txt", 'utf-8', (err) => {if (err) console.log(err) });

        if (MyHtml == DataBaseHtml) {
            unlink("./NewHtml.txt", (err)=>{ if(err) console.log(err)});
            console.log("değişiklik yapılmadı");
        } else {
            //notification

            console.log("değişiklik yapıldı");

            //Change
            unlink('./DatabaseHtml.txt', (err) => { if(err) console.log(err); });
            writeFile('./DatabaseHtml.txt', `${MyHtml}`, 'utf-8', (err) => { if(err) console.log(err); });
            unlink('./NewHtml.txt', (err) => { if(err) console.log(err); });
        }

    }
    else {
        writeFile('DatabaseHtml.txt', `NewDataBaseHtml`, 'utf8', (err) => {
            if (err) console.log(err);
        });
    }
}

async function Mysystem() {
    let mypromis = new Promise((resolve, reject)=>{
        resolve(Getir());
    });
    await mypromis.then(DegistirDuzenle());
}
Mysystem();

I want to create a txt file, read it and delete it later. I have 2 function 1.(Getir()) Create txt, 2.(DegistirDuzenle()) read txt and delete but 2. function starts working first and I getting error. "Error: ENOENT: no such file or directory, open './NewHtml.txt'"

any chance of more context, what the errors actually are, or maybe a sandbox link? Check out the [How do I ask a good question? post](https://stackoverflow.com/help/how-to-ask) to learn how to better structure a question. It's beneficial for everyone. — damonholden, Nov 28 '22 at 15:53
You are using both ways to handle promises. Can you give us tell us if Getir and DegistirDuzenle are also async functions ? — Hedi Zitouni, Nov 28 '22 at 15:58
Please also post the code of `Getir` and `DegistirDuzenle`. You can [edit] your question to include them. — Bergi, Nov 28 '22 at 16:03

score 0 · Answer 1 · answered Nov 28 '22 at 15:59

0

async function Mysystem() {
    let mypromis = new Promise((resolve, reject)=>{
        resolve(Getir());
    });
    await mypromis()
    await DegistirDuzenle()
}

Mysystem()

answered Nov 28 '22 at 15:59

İsmail

45
3

Bergi · Answer 2 · 2022-11-28T16:16:57.933

0

You should use

async function Mysystem() {
    await Getir();
    await DegistirDuzenle();
}

or

function Mysystem() {
    return Getir().then(DegistirDuzenle);
}

but not a mix of them. Also notice that when passing the DegistirDuzenle function to .then() as a callback, it shouldn't be invoked (passing the result of a call, not passing the function). Alternatively, you could write .then((getirResult) => DegistirDuzenle()).

Also, for this to work, you'll need to properly promisify the code in Getir and DegistirDuzenle.

edited Nov 28 '22 at 16:16

answered Nov 28 '22 at 16:00

Bergi

630,263
148
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1,375

both didn't work I guess because my functions are not asynchronous – CilginSinek Nov 28 '22 at 16:22
Yes indeed. `Getir()` needs to return a promise that fulfills when the file is downloaded. – Bergi Nov 28 '22 at 16:24
my promise stays in the```Promise { }``` state for ```console.log(await getir())```. how to make my function turn promise – CilginSinek Nov 28 '22 at 17:12
See https://stackoverflow.com/q/22519784/1048572 – Bergi Nov 28 '22 at 17:15

how can I run my functions be sequentially

2 Answers2