Sort alphabetically elements in array of object (error)

Question

Well, when i'm trying to use the array like this let titles = ["Julian","August"] the .sort() works, but when i try to use like that

function showTitles(jsonObj) {
    let filmes = jsonObj.filmes;
    for (let i = 0; i < filmes.length; i++) {
        let titles = [];
        titles.push(filmes[i].title);
        console.log(titles.sort());
    }
}

doesn't work. I have a json of objects with titles and I want to sort this alphabetically.

the json:

{
  "filmes": [
    {
      "id": "01",
      "title": "Os Simpsons O Filme",
      "url": "https://youtu.be/KCpcGsFl90c",
      "image": "sMcsZ7BlOf2LDhTlfPlWb3w6lJM.jpg",
      "sinopse": "Homer Simpson.",
      "time": "1h:26m",
      "quality": "720p",
      "latestAdded": false,
      "problem": false,
      "release": "27/07/2007",
      "version": "Dublado",
      "gender": [
        "Animação",
        "Comédia"
      ]
    }
}

Please if someone knows how to do this works, help me :/

do you want to sort the object by its keys, so do you want to get output like this: "filmes": [ { "a":"01", "b": "lorem", "z": "dummy", } — ahmetbcakici
– ahmetbcakici, Commented Jun 29, 2020 at 2:52

Spidy · Accepted Answer · 2020-06-29 02:51:42Z

let is block scoped. This means it only exists inside the { } it was created in. Each iteration of your for loop is creating a branch new titles variable that is empty. You then sort it with only one value in it.

Here's another way to write it so that you aren't losing the variable each iteration:

function showTitles(jsonObj) {
    let filmes = jsonObj.filmes;
    let titles = [];

    for (let i = 0; i < filmes.length; i++) {
        titles.push(filmes[i].title);
    }

    console.log(titles.sort());
}

There's also a great built in map function that can reduce the amount of code for this. It uses a lot of ES6 syntax, so if you are new to JS I don't recommend using it until you have a good grasp of the fundamentals.

let titles = jsonObj.filmes.map(({ title }) => title);
console.log(titles.sort());

thank you, but, when i do that, and trying to have just 1 value, i cant, because print all in one

Murilo Góes de Almeida · Accepted Answer · 2020-06-29 02:59:48Z

1

You can't initialize the array inside of for loop because it Will reset in every new loop

    function showTitles(jsonObj) {
        let filmes = jsonObj.filmes;
        let titles = [];
        for (let i = 0; i < filmes.length; i++) {
  
         titles.push(filmes[i].title);
        }
     console.log(titles.sort());
    }

answered Jun 29, 2020 at 2:59

Murilo Góes de Almeida

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1 Comment

TheReyzer Over a year ago

thank you, but, when i do that, and trying to have just 1 value, i cant, because print all in one

Splox · Accepted Answer · 2020-06-29 02:44:15Z

I am not sure whether you posted JSON or a JavaScript object literal; it is neither valid JS nor valid JSON because you can't have an empty value like "id": ,. Did you mean:

{
      "id": '',
      "title": "Ratatouille",
      "url": '',
      "image": '',
      "sinopse": '',
      "time": '',
      "quality": '',
      "latestAdded": '',
      "problem": '',
      "release": '',
      "version": '',
      "gender": [

      ]
}

In that case, your method won't work because there is no property filmes on the object.

Also, your naming of the parameter as jsonObj doesn't make sense -- JSON is parsed into a regular JavaScript object, so did you mean to call it something like filmesObj?

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