Pushing objects to an array in node js

Question

'both' is my object that should hold 2 arrays: eng, fr.

These arrays each, hold multiple objects.

How do I push every value from frDisplayData to fr:[] in my 'both' object:

const displayData = [];
var both = {eng:displayData, fr:[]};
displayData.forEach(function (item) {
  // You must call .then on the promise to capture the results regardless of the promise state (resolved or still pending)
  translateText(item.explanation, 'fr').then(function(result) {
    frExplanation = result;
    frTitle = translateText(item.title, 'fr').then(function(result) {
      frTitle = result;
      frDisplayData = {
          date: item.date,
          explanation: frExplanation,
          hdurl: item.hdurl,
          media_type: item.media_type,
          service_version: item.service_version,
          tite: frTitle,
          url: item.url
        }
      console.log(frDisplayData);
    })
  });
})

Any simplified solution to this would also help.

Currently, console.log(frDisplayData); gives me the following:

 {
  date: '2022-03-26',
  explanation: "xyz",        
  hdurl: 'xyz.jpg',
  media_type: 'image',
  service_version: 'v1',
  tite: 'Pluton la nuit',
  url: 'xyz.jpg'
}
{
  date: '2022-03-27',
  explanation: "abc",        
  hdurl: 'abc.jpg',
  media_type: 'image',
  service_version: 'v1',
  tite: 'Titan Seas reflète la lumière du soleil',
  url: 'abc.jpg'
}

Answer 1

From what I understand, you have an array displayData containing data in English and you want translate title and explanation properties in each element to French and store in fr variable.

You can use forEach loop on display data and async, await on promise to get much cleaner code.

const displayData = [
  {
    title: "title1",
    explanation: "exp1",
    // other props
  },
];

const fr = [];

// use async callback func in foreach
displayData.forEach(async (each) => {
  // create a copy of eng element
  const eachfr = { ...each };
  
  // use await operators to for translation
  // translate required properties to french
  eachfr.title = await translate(each.title, 'fr');
  eachfr.explanation = await translate(each.explanation, 'fr');
  
  fr.push(eachfr);
});

const both = { eng: displayData, fr: fr };

Answer 2

"fr" is a key within the "both" object. All you would have to do is add both.fr.push(frDisplayData) within your "forEach" loop.

const displayData = [];
var both = {eng:displayData, fr:[]};
displayData.forEach(function (item) {
  // You must call .then on the promise to capture the results regardless of the promise state (resolved or still pending)
  translateText(item.explanation, 'fr').then(function(result) {
    frExplanation = result;
    frTitle = translateText(item.title, 'fr').then(function(result) {
      frTitle = result;
      frDisplayData = {
          date: item.date,
          explanation: frExplanation,
          hdurl: item.hdurl,
          media_type: item.media_type,
          service_version: item.service_version,
          tite: frTitle,
          url: item.url
        }
      console.log(frDisplayData);
      both.fr.push(frDisplayData);
    })
  });
})