Why doesn't JavaScript have a last method? [closed]

Answer 1

Here is another simpler way to slice last elements

 var tags = [1, 2, 3, "foo", "bar", "foobar", "barfoo"];
 var lastObj = tags.slice(-1);

lastObj is now ["barfoo"].

Python does this the same way and when I tried using JS it worked out. I am guessing string manipulation in scripting languages work the same way.

Similarly, if you want the last two objects in a array,

var lastTwoObj = tags.slice(-2)

will give you ["foobar", "barfoo"] and so on.

Answer 2

Yeah, or just:

var arr = [1, 2, 5];
arr.reverse()[0]

if you want the value, and not a new list.

Answer 3

Because Javascript changes very slowly. And that's because people upgrade browsers slowly.

Many Javascript libraries implement their own last() function. Use one!

Answer 4

Another option, especially if you're already using UnderscoreJS, would be:

_.last([1, 2, 3, 4]); // Will return 4

Answer 5

Array.prototype.last = Array.prototype.last || function() {
    var l = this.length;
    return this[l-1];
}

x = [1,2];
alert( x.last() )

Answer 6

You can do something like this:

[10, 20, 30, 40].slice(-1)[0]

console.log([10, 20, 30, 40].slice(-1)[0])

The amount of helper methods that can be added to a language is infinite. I suppose they just haven't considered adding this one.