Extra comma in JS

Question

JavaScript

There was a dispute about an error that occurs in IE if an extra comma is encountered in the code.
The situation is simple: If the last comma is not removed, IE does not process the script. All other browsers will work with a bang. Question: Who is right? The coder and his comma (along with all browsers) or IE (which doesn't want to handle a clear programmer's mistake).
items: [
{xtype: 'textfield', cls: 'fake-field', value: 'Manager Login'},
new Ext.form.TextField(Ext.applyIf({fieldLabel: 'Username', name: 'login', allowBlank:false}, fieldConfig)),
this.passwordField,
this.passwordConfirmField,
new Ext.form.Hidden({name: 'companyId'}),
]


Answer 1

in my unprofessional opinion, the programmer is wrong. The comma is clearly superfluous here, in whatever grammar you think.

Answer 2

Explains everything .

Answer 3

To be a comma at the end of enumerations!
And IE... Well, it's always been "special".

Answer 4

In general, we figured it out: commas are allowed in the 5th edition of ECMA-262, but browsers only support the 3rd edition, in which commas are not allowed.

Answer 5

The proger is wrong, and for some reason we have a lot of people who are not right at work.
And not only in JS,
probably because people are not Sishniks and not even Pascalists - but any “normal” languages ​​​​hardly kill any syntax violation.
And they teach not to write extra quotations very quickly

Answer 6

wrong IE, because, according to the standards, a comma at the end can stand. this is done for the convenience of programming and code generation

Answer 7

With arrays (Array) in IE (even 6) there seems to be no such problem, but as for objects used as associative arrays, this has already been fixed since IE8:

var obj = {
	'lorem' : 'first',
	'ipsum' : 'second',
};

In total, the programmer is right, but because of IE6-7, it is still inconvenient to do it - without a comma after the last element.

Answer 8

According to the standard, a comma is not allowed there. IE is right (this is probably the only such case).

Answer 9

I'm interested in something else, why does ie fall, bumping into this comma? For me, it worked quite well in cases like this.