array filter includes javascript code example
Example 1: how to check if an element exists in an array of objects js
var arr = [{ id: 1, username: 'fred' },
{ id: 2, username: 'bill'},
{ id: 3, username: 'ted' }];
function userExists(username) {
return arr.some(function(el) {
return el.username === username;
});
}
console.log(userExists('fred'));
console.log(userExists('bred'));
Example 2: how the filter() function works javascript
const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
const filter = arr.filter((number) => number > 5);
console.log(filter);
Example 3: filter out object in array using two arguments
var arr= [{id: "123", name: "Faa"},
{id: "123", name: "Bar"},
{id: "345", name: "Foo"},
{id: "678", name: "FaaBar"}
];
var name = 'FaaBar';
var id = '678';
arr = arr.filter(function(elem) {
return !(elem.id == id && elem.name == name)
});