Question

When I evaluate the following javascript in Safari 6.0:

Array.indexOf([1,2,3],3)

It returns -1, essentially saying that 3 is not in the array!

But in Firefox it correctly returns 2.

I know that Array.indexOf is a relatively new function so I have code that tests if it is present and if not defines it. However it appears this function is built in to Safari.

Is this a bug, or am I doing something wrong?

Edit: This is actually a simplified version of the problem. What I am actually doing is trying to locate the index of a TD cell in a TR:

var tr = td.parentNode
var col = Array.indexOf(tr.cells,td)

tr.cells does not have an indexOf. But, using Array.indexOf I can treat it as such, at least in Firefox. In Safari this does not work.

I guess in this case I could actually use cellindex, but if that was not defined, how would I go about getting the index?

Answer 1

I’m wondering why you don’t use it like intended:

[1,2,3].indexOf( 3 );

Unless it’s an academic question. In that case it’s actually a bug special Firefox implementation. If you want to use the Array.prototype version directly, you should go like

Array.prototype.indexOf.call([1,2,3], 3);