Usage of String[..] Array operation

Question

I have seen the following javascript in a webpage.

s = String["fromC" + aa.nodeValue];

May I know what is the usage of String[...]?

Where did you see that? I need a link or I can't believe it. — Bergi
– Bergi, Commented Jul 10, 2014 at 4:21

Phil · Accepted Answer · 2014-07-10 04:17:14Z

2

The square-bracket notation is just another way to access object properties or methods, usually by some kind of variable as opposed to the dot notation which accesses properties by symbol or key.

Say aa.nodeValue was equal to the string "harCode". This would work like this

var s = String["fromCharCode"];

Which is equivalent to

var s = String.fromCharCode;

So s is now a pointer to the static fromCharCode method on String.

Similarly, if aa.nodeValue was equal to "odePoint", you would be referencing String.fromCodePoint

edited Jul 10, 2014 at 4:17

answered Jul 10, 2014 at 4:11

Phil

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Comments

Sudhir Bastakoti · Accepted Answer · 2014-07-10 04:19:24Z

1

Its just String.fromCharCode(), written in an obfuscated way, it can be like:

aa = document.createTextNode("harCode");
s = String["fromC" + aa.nodeValue];

which would finally become String["fromCharCode"] which is equivalent to String.fromCharCode

answered Jul 10, 2014 at 4:19

Sudhir Bastakoti

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