Javascript - How to get last record from array list?

Question

I have an array list and and I want only last record from the array list, how to get that?

I want message(i.e. Hey) from last record of this array.

here is my code:

let chats : any = [];

  items.forEach((item) =>
  {
    if(item.val().sent_by == loggedInUserKey && item.val().sent_to == UserKey)
    {
      chats.push({
        key              : item.key,
        sent_by          : item.val().sent_by,
        sent_to          : item.val().sent_to,
        message          : item.val().message,
        datetime         : item.val().datetime
      });
    }
    if(item.val().sent_to == loggedInUserKey && item.val().sent_by == UserKey)
    {
      chats.push({
        key              : item.key,
        sent_by          : item.val().sent_by,
        sent_to          : item.val().sent_to,
        message          : item.val().message,
        datetime         : item.val().datetime
      });
    }
  });
  this.chats = chats;
  var last = chats[chats.length - 1];
  console.log("last: ",last);
  console.log("Chats : ",this.chats);

Please help. Thanks in advance.

you want `angular html template` or just `javascript` code to access last record? — Naman Kheterpal, May 02 '18 at 06:30

score 6 · Answer 1 · answered May 02 '18 at 06:32

6

You could just use array.length-1 to find the last value. I'll include a code snippet demonstration below:

const myArrayList = ['abc', 'def', 'ghi', 'jkl', 'mno', 'pqr', 'stu'];

console.log(myArrayList[myArrayList.length - 1]);

answered May 02 '18 at 06:32

Cory Kleiser

1,969
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Alex Baban · Accepted Answer · 2018-05-02T06:40:43.313

3

Try this:

var lastMessage = chats[chats.length - 1].message;
console.log(lastMessage);

edited May 02 '18 at 06:40

answered May 02 '18 at 06:35

Alex Baban

11,312
4
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44

Thanks. worked it. :) – Shreyas Pednekar May 02 '18 at 06:41

score 2 · Answer 3 · answered May 02 '18 at 06:31

2

use array[array.length - 1]

Example:

var array = [1,2,3,4,5,6,7,8,9,10];

var lastVal = array[array.length - 1];

console.log(lastVal);

answered May 02 '18 at 06:31

score 2 · Answer 4 · answered May 02 '18 at 06:34

2

You could write something like this:

someArray[someArray.length - 1]

answered May 02 '18 at 06:34

qopa

111
4

score 0 · Answer 5 · answered May 02 '18 at 06:34

0

You can use negative indexes to access elements from last as:

var last = myArray[-1]

answered May 02 '18 at 06:34

Naman Kheterpal

1,810
1
9
16

It is displaying "undefined" – Shreyas Pednekar May 02 '18 at 06:37

score 0 · Answer 6 · answered May 03 '18 at 20:56

0

If you are purely interested in the last element of a JavaScript Array you can use .pop()

var arr = ['first', 'second', 'last'];
var item = arr.pop();
console.log('accessed item: ', item);

answered May 03 '18 at 20:56

dkaramazov

204
2
9

Javascript - How to get last record from array list?

6 Answers6