How to retrieve last element id of array in Angular 2

Question

I am trying to get id of last element of my array.

This is how I am fetching last element of my array

let last = this.Array[this.Array.length-1];
console.log(last);

Here is the console of last element of array-

Object {id: 48, title: "I'm used to this"}
 title: "I'm used to this"
 id:  48
__proto__:  Object

Here is the list on which I have looked already-

How to retrieve the clicked ElementId in angularjs?
How to get the object's id?
how to get the id name in html for any object and many more but I could not.

I just wanted to access id : 48, can any one help me to do so.
Thanks In Advance.

It shows this- Error TS2339: Property 'id' does not exist on type 'Object'. — S.Yadav
– S.Yadav, Commented Jun 14, 2017 at 7:24
Seems more a problem with your linter configuration, or use concrete classes and interfaces instead of Object if you have such strict linter rules configured. — Günter Zöchbauer
– Günter Zöchbauer, Commented Jun 14, 2017 at 7:27
Thanks all, It is working for me, it was issue with declare part, initially it was- export class classname{ myArray: <object> } which I just changed with export class classname{ myArray: <any> } and it's working fine now. — S.Yadav
– S.Yadav, Commented Jun 14, 2017 at 8:24

Duannx · Accepted Answer · 2017-06-14 08:09:25Z

11

Just do that:

let last:any = this.Array[this.Array.length-1];
console.log(last.id);

answered Jun 14, 2017 at 8:09

Duannx

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Comments

anoop · Accepted Answer · 2017-06-14 07:44:17Z

6

You can do this.Array.slice(-1)[0].id, and with slice your original array is not changed too.

DEMO :

var array = [{
  id: 43,
  title: "I'm used to this"
},{
  id: 44,
  title: "I'm used to this"
},{
  id: 45,
  title: "I'm used to this"
},{
  id: 46,
  title: "I'm used to this"
},{
  id: 47,
  title: "I'm used to this"
},{
  id: 48,
  title: "I'm used to this"
}]

console.log('last id : ' + this.array.slice(-1)[0].id)

Update:

As your Array item is type of Object, So first convert it to some real class\interface type, Something like:

export  interface arrayItem{
    id?: number;
    title?: string;
}

then define your array type, like :

your Array like

this.Array : Array<arrayItem> = [ {
  id: 48,
  title: "I'm used to this"
  },
  //your other array items
]

edited Jun 14, 2017 at 7:44

answered Jun 14, 2017 at 7:26

anoop

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2 Comments

S.Yadav Over a year ago

Nope here is result- Error TS2339: Property 'id' does not exist on type 'Object'.

anoop Over a year ago

convert your object into concrete class\interface for your object, like: export interface arrayItem{id: number; title: string; }, then make your array of type Array<arrayItem>

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