JavaScript The method filter JS method filter javascript,method filter js,method filter does not

There is a function that returns an array according to the second argument (if the country is Japan, it will return only brands of cars from Japan). Is it possible to improve the function using only the filter method?

const arr = [
   {  
     "name":"BMW",
     "price":"55 000",
     "country":"Germany",
     "sertificate":"yes"
  },
  {  
    "name":"Mercedes-benz",
    "price":"63 000", 
    "country":"Germany",
    "certificate":"yes"
  },
  {  
    "name":"Mitsubishi",
    "price":"93 000", 
    "constructor":"Bar John",
    "door":"3",
    "country":"Japan",
  },
  {  
    "name":"TOYOTA", 
    "price":"48 000", 
    "max_people":"7",
    "country":"Japan",
    "certificate":"yes"
  },
  {  
    "name":"Volkswagen",
    "price":"36 000", 
    "constructor":"Pier Sun",
    "country":"Germany",
    "certificate":"no"
  },
 ];

 function getCountry(arr, country) {
   let obj = arr.filter(function(arr){
      return arr.country === country ? arr.country : '';
   });
   let itemCountry = [{}];
   let newItem = 0;
   Object.keys(obj).forEach (item => (obj[item]!==null) ? (itemCountry[newItem]=obj[item] , newItem++): '');
   return itemCountry;
}

console.log(getCountry(arr,"Japan"));  // or any other country

Answer:1

I think there is no need of any code after filter().Here is the version using Arrow Functions

const arr = [ { "name":"BMW", "price":"55 000", "country":"Germany", "sertificate":"yes" }, { "name":"Mercedes-benz", "price":"63 000", "country":"Germany", "sertificate":"yes" }, { "name":"Mitsubishi", "price":"93 000", "constructor":"Bar John", "door":"3", "country":"Japan", }, { "name":"TOYOTA", "price":"48 000", "max_people":"7", "country":"Japan", "sertificate":"yes" }, { "name":"Volkswagen", "price":"36 000", "constructor":"Pier Sun", "country":"Germany", "sertificate":"no" }, ];

const getCountry = (arr, country) => arr.filter(x => x.country === country);
console.log(getCountry(arr,"Japan"));

Answer:2

You could go a step ahead and use an abstract solution, where you can add a key and a wanted value for filtering the array.

const
    getItems = (array, key, value) => array.filter(o => o[key] === value),
    data = [{ name: "BMW", price: "55 000", country: "Germany", sertificate: "yes" }, { name: "Mercedes-benz", price: "63 000", country: "Germany", certificate: "yes" }, { name: "Mitsubishi", price: "93 000", constructor: "Bar John", door: "3", country: "Japan" }, { name: "TOYOTA", price: "48 000", max_people: "7", country: "Japan", certificate: "yes" }, { name: "Volkswagen", price: "36 000", constructor: "Pier Sun", country: "Germany", certificate: "no" }];

console.log(getItems(data, "country", "Japan"));

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer:3

I think this should help.

arr.filter(i => i.country === "Japan");

You can learn more about filter here.

Answer:4

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