How do I remove an object from an array with JavaScript? [duplicate]

I have an JavaScript object like this:

id="1";
name = "serdar";

and I have an Array which contains many objects of above. How can I remove an object from that array such as like that:

obj[1].remove();

Solution 1:

Well splice works:

var arr = [{id:1,name:'serdar'}];
arr.splice(0,1);
// []

Do NOT use the delete operator on Arrays. delete will not remove an entry from an Array, it will simply replace it with undefined.

var arr = [0,1,2];
delete arr[1];
// [0, undefined, 2]

But maybe you want something like this?

var removeByAttr = function(arr, attr, value){
    var i = arr.length;
    while(i--){
       if( arr[i] 
           && arr[i].hasOwnProperty(attr) 
           && (arguments.length > 2 && arr[i][attr] === value ) ){ 

           arr.splice(i,1);

       }
    }
    return arr;
}

Just an example below.

var arr = [{id:1,name:'serdar'}, {id:2,name:'alfalfa'},{id:3,name:'joe'}];
removeByAttr(arr, 'id', 1);   
// [{id:2,name:'alfalfa'}, {id:3,name:'joe'}]

removeByAttr(arr, 'name', 'joe');
// [{id:2,name:'alfalfa'}]

Solution 2:

If you have access to ES2015 functions, and you're looking for a more functional approach I'd go with something like:

const people = [
  { id: 1, name: 'serdar' },
  { id: 5, name: 'alex' },
  { id: 300, name: 'brittany' }
];

const idToRemove = 5;

const filteredPeople = people.filter((item) => item.id !== idToRemove);

// [
//   { id: 1, name: 'serdar' },
//   { id: 300, name: 'brittany' }
// [

Watch out though, filter() is non-mutating, so you'll get a new array back.

See the Mozilla Developer Network notes on Filter.

Solution 3:

Cleanest and fastest way (ES6)

const apps = [
  {id:1, name:'Jon'}, 
  {id:2, name:'Dave'},
  {id:3, name:'Joe'}
]

//remove item with id=2
const itemToBeRemoved = {id:2, name:'Dave'}

apps.splice(apps.findIndex(a => a.id === itemToBeRemoved.id) , 1)

//print result
console.log(apps)

Update: if any chance item doesn't exist in the look up array please use below solution, updated based on MaxZoom's comment

const apps = [
  {id:1, name:'Jon'}, 
  {id:3, name:'Joe'}
]

//remove item with id=2
const itemToBeRemoved = {id:2, name:'Dave'}

const findIndex = apps.findIndex(a => a.id === itemToBeRemoved.id)

findIndex !== -1 && apps.splice(findIndex , 1)

//print result
console.log(apps)