Is there any difference between Array() and new Array()

[Xu, Qian]

Hi All,

I have defined a function
function fct(arr) { ... }

When I call this function, I prefer to write
fct(Array(item1, item2));

But if I write
fct(new Array(item1, item2));
The code above works as well. But Will it cause any memory leaks?

 

[Peter Michaux]

Hi All,

I have defined a function
function fct(arr) { ... }

When I call this function, I prefer to write
fct(Array(item1, item2));

But if I write
fct(new Array(item1, item2));
The code above works as well. But Will it cause any memory leaks?

--------------

<URL: http://www.ecma-international.org/publications/standards/Ecma-262.htm>

15.4.1 The Array Constructor Called as a Function
When Array is called as a function rather than as a constructor, it
creates and initialises a new Array
object. Thus the function call Array(...) is equivalent to the object
creation expression
new Array(...) with the same arguments.

--------------

Of course, you need to test the implementations to see if they
conform. I would guess "new Array()" is safer than "Array()".

The advantage of "new Array()" looks the same as your own JavaScript
constructors "new MyConstructor()"

Peter

 

[RobG]

Hi All,

I have defined a function
   function fct(arr) { ... }

When I call this function, I prefer to write
   fct(Array(item1, item2));

But if I write
   fct(new Array(item1, item2));
The code above works as well.

Further to what Peter wrote, you could also use an array literal:

fct([item1, item2]);