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let people = [

  { name: "Steve", age: 27, country: "America" },

  { name: "Jacob", age: 24, country: "America" }

];

​

let filteredPeople = people.filter(function (currentElement) {

  // the current value is an object, so you can check on its properties

  return currentElement.country === "America" && currentElement.age < 25;

});

​

console.log(filteredPeople);

// [{ name: "Jacob", age: 24, country: "America" }]

​

const userDetails = {

    firstName: "Jane",

    lastName: "Daniels",

    userName: "jane.daniels",

    email: "jane.daniels@example.com",

    comapny: "Example Inc.",

    address: "1234 Example Street",

    age : 25,

    hobby: "Singing"

};

​

const userNames = Object.keys(userDetails)

    .filter((key) => key.includes("Name"))

    .reduce((object, key) => {

        return Object.assign(object, {

          [key]: userDetails[key]

        });

  }, {});

​

console.log(userNames);

var arr = [1,2,3,4],

    brr = [2,4],

    res = arr.filter(f => !brr.includes(f));

console.log(res);

function isBigEnough(value) {

  return value >= 10

}

​

let filtered = [12, 5, 8, 130, 44].filter(isBigEnough)

// filtered is [12, 130, 44]

​