Example 1: how to filter object in javascript
let arr = [
{name: "John", age: 30},
{name: "Grin", age: 10},
{name: "Marie", age: 50},
];
let newArr = arr.filter((person)=>(return person.age <= 40));
Example 2: 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}];
let x = arr.filter((a)=>{if(a.title=='B'){return a}});
console.log(x)
Example 3: 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”;
});
Example 4: 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 5: javascript filter array of objects by key
var data = { records : [{ "empid": 1, "fname": "X", "lname": "Y" }, { "empid": 2, "fname": "A", "lname": "Y" }, { "empid": 3, "fname": "B", "lname": "Y" }, { "empid": 4, "fname": "C", "lname": "Y" }, { "empid": 5, "fname": "C", "lname": "Y" }] }
var empIds = [1,4,5]
var filteredArray = data.records.filter(function(itm){
return empIds.indexOf(itm.empid) > -1;
});
filteredArray = { records : filteredArray };
Example 6: filter array object by its elements
const things = {
thing: [
{ place: 'here', name: 'stuff' },
{ place: 'there', name: 'morestuff1' },
{ place: 'there', name: 'morestuff2' },
],
};
const removeDuplicates = (array, key) => {
return array.reduce((arr, item) => {
const removed = arr.filter(i => i[key] !== item[key]);
return [...removed, item];
}, []);
};
console.log(removeDuplicates(things.thing, 'place'));