javascript array filter objects code example

Example 1: how to filter an array of objects in javascript

let arr=[{id:1,title:'A', status:true}, {id:3,title:'B',status:true}, {id:2, title:'xys', status:true}];
//find where title=B
let x = arr.filter((a)=>{if(a.title=='B'){return a}});
console.log(x)//[{id:3,title:'B',status:true}]

Example 2: js filter array of objects by value

var heroes = [
	{name: “Batman”, franchise: “DC”},
	{name: “Ironman”, franchise: “Marvel”},
	{name: “Thor”, franchise: “Marvel”},
	{name: “Superman”, franchise: “DC”}
];

var marvelHeroes =  heroes.filter(function(hero) {
	return hero.franchise == “Marvel”;
});

// [ {name: “Ironman”, franchise: “Marvel”}, {name: “Thor”, franchise: “Marvel”} ]

Example 3: javascript filter array of objects

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" }]

Example 4: filter

const array = [-3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]; 

function isPrime(num) {
  for (let i = 2; num > i; i++) {
    if (num % i == 0) {
      return false;
    }
  }
  return num > 1;
}

console.log(array.filter(isPrime)); // [2, 3, 5, 7, 11, 13]