Reference last element of an array in Javascript?

Question

In my code, I have a lot code like this:

my_array[my_array.length - 1] = sth;

Is it possible to define a simple variable to point to last element of array?like this:

var ref =  (&|*, sth like that) my_array[my_array.length - 1];
ref = sth;

Yes, a lot of repeated my_array[my_array.length - 1], kind of noising — nfpyfzyf
– nfpyfzyf, Commented Mar 28, 2013 at 2:12
splice() work for you?, with a negative index i.e. my_array.splice(-1,1,sth) — OJay
– OJay, Commented Mar 28, 2013 at 2:14

Karol · Accepted Answer · 2013-03-28 02:12:09Z

5

You will have to change array prototype, and use it like below:

var arr = ['a','b','c'];

Array.prototype.last=function() {
    if(this.length >= 1) {
        return this[this.length - 1];
    }
    else {
        return null;
    }
};

arr.last();

Shuold work - you can check it in Chrome JS console.

answered Mar 28, 2013 at 2:12

Karol

8,08313 gold badges51 silver badges68 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Karol Over a year ago

Yeah - I think it's best way to achieve this goal.

J. Holmes Over a year ago

Another fun trick would be to use var ref = Array.prototype.last.bind(arr), to bind the function to an instance, so you don't have to pass around the array, just a bound function that returns the last item of desired array.

Collectives™ on Stack Overflow

Reference last element of an array in Javascript?

1 Answer 1

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related