Different output across browser for Javascript code

Question

Below is what I have in Javascript

var x=["1","2","3","4","5","6"];
c = (b = x[1])[0] ;
alert("B=" + b);
alert("C=" + c);

When I run this in Firefox 9.0.1, I get below output.

B=2
C=2

When I run same in IE7, I get below output.

B=2
C=undefined

Can I know why IE is displaying as undefined??

Thanks in advance!!!

Guffa · Accepted Answer · 2012-01-29 10:04:35Z

4

That's because IE7 doesn't support accessing strings by index.

This works in all browsers:

c = (b = x[1]).charAt(0);

answered Jan 29, 2012 at 10:04

Guffa

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Comments

KARASZI István · Accepted Answer · 2012-01-29 10:08:03Z

1

That's because Internet Explorer does not support the array-like character access for Strings.

In your code, you want to access the first character of the following String: "2" which is not supported in Internet Explorer.

You can use String.charAt() to achieve the same results:

c = (b = x[1]).charAt(0);

answered Jan 29, 2012 at 10:08

KARASZI István

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