Mapping object values from one object to another

Question

I have a locale object that looks like this

 {
    hello.title: {
     en: "Hi",
     sv: "Hej"
    },
    hello.text: {
     en: "Hur mår du?",
     sv: "How are you?"
    },
}

   function mapToNewObj(locale, obj) {


    // Here I want to return a new object that looks like this
        let's say the locale is "sv"

       return {
        hello.title: Hej,
        hello.text: 'Hur mår du?'
      }
}

I want to create a new object where the key is for example "hello.title" and the value is the string for the locale that is passed in as the first argument.

How should I do it?

Answer 1

return {
     'hello.title': obj['hello.title'][locale],
     'hello.text': obj['hello.text'][locale]
}

or through loop

result = {}
for (var key in obj) {
  if (obj.hasOwnProperty(key)) {
    result[key] =  obj[key][locale]
  }
}
return result

Answer 2

 let input = { 'hello.title': { 'en': "Hi", 'sv': "Hej" }, 'hello.text': { 'sv': "Hur mår du?", 'en': "How are you?" }, }; function mapToNewObj(locale, obj) { return { 'hello.title': input['hello.title'][locale], 'hello.text': input['hello.text'][locale] } } console.log(mapToNewObj('sv', input)); 

Answer 3

Using a generic approach you could

var Language = {
    "hello.title": {
     en: "Hi",
     sv: "Hej"
    },
    "hello.text": {
     en: "Hur mår du?",
     sv: "How are you?"
    },
}
;

// fn receives (value, key), returns a new value for key.
const mapKeys = (fn) => obj => Object.entries(obj)
  .reduce((res, [k, v]) => ({...res, [k]: fn.apply(null, [v, k])}), {});

const get = (key) => obj => obj[key];

console.log(mapKeys(get("sv"))(Language));

mapKeys takes a function fn and returns a new function which takes an object. It returns an object with the same shape but with value produced by fn . Here fn is simply get which just selects a given field inside an object.

Answer 4

You mean something like this?

var Language = {
  en: {
    title: 'hey',
    text: 'Hur mår du?',
  },
  sv: {
    title: 'hej',
    text: 'How are you?',
  },
};

//  @param {string} locale The locale language return as "sv" or "en"

function returnLanguageMessage(locale) {
  return {
    Language[locale].title,
    Language[locale].text
  };
}