filter object of array javascript code example

Example 1: how to filter object in javascript

// use filter() function. Let say we have array of object.
let arr = [
  {name: "John", age: 30},
  {name: "Grin", age: 10},
  {name: "Marie", age: 50},
];
//Now I want an array in which person having age more than 40 is not
//there, i.e, I want to filter it out using age property. So
let newArr = arr.filter((person)=>(return person.age <= 40));
//filter function expects a function if it return true then it added 
//into new array, otherwise it is ignored. So new Array would be
/* [
	{name: "John", age: 30},
  	{name: "Grin", age: 10},
   ]
*/

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: filtering json array in javascript

const data = [
  {
    name: 'Bob',
    gender: 'male',
    age: 34,
  },
  {
    name: 'Carol',
    gender: 'female',
    age: 36,
  },
  {
    name: 'Ted',
    gender: 'male',
    age: 38,
  },
  {
    name: 'Alice',
    gender: 'female',
    age: 40,
  },
];

const arr1 = data.filter(d => d.age > 37);
console.log('arr1', arr1);

const arr2 = data.filter(d => d.gender === 'female');
console.log('arr2', arr2);

const ageAndGender = d => d.age > 37 && d.gender === 'female';

const arr3 = data.filter(ageAndGender);
console.log('arr3', arr3);

Example 4: filter out arrays js

let newArray = array.filter(function(item) {
  return condition;
});

Example 5: javascript filter array of objects

function isBigEnough(value) {
  return value >= 10
}

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