what's the difference between below js codes?

Question

ATT, is there any difference between below implements?
1.

var a = [];
f = function(){
    a = [].concat(a,[].slice.call(arguments));
}

2.

var a = [];
f = function(){
    a = Array.prototype.concat(a,[].slice.call(arguments));
}

this will help : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/concat — F.C.Hsiao, Dec 23 '13 at 07:31
possible duplicate of [apply function in JavaScript](http://stackoverflow.com/questions/8669527/apply-function-in-javascript) — mahesh, Dec 23 '13 at 07:33

score 2 · Answer 1 · edited May 23 '17 at 10:32

2

There is no difference other than implicitly or explicitly calling Array.prototype.concat.

It's unclear what you're trying to accomplish, but the function f can be simplified as follows.

var a = [];

var f = function() {
    a = a.concat( [].slice.call(arguments) );
}

You can find more information about Array.prototype.concat here. Additionally, this question has a good discussion of prototype functions.

edited May 23 '17 at 10:32

Community

answered Dec 23 '13 at 07:32

Austin Brunkhorst

thanks @Austin, i found the second way in a Chinese famous website named [Douban](http://douban.com), and i was wondering why they are using that way instead of an easier way. – YuC Dec 24 '13 at 03:02

1 Answers1