Couple of questions | Defend the Web

KeyboardGod
6 years ago

0

a = window.location.host + ""; b = a.length; c = 4 + ((5 * 10) * 2); d = String.fromCharCode(c, -(41 - Math.floor(1806 / 13)), Math.sqrt(b - 2) * 29, (b * 8) - 29);

I just made the javascript do the work and it gave me the “hats” value.

But..

I didn’t exactly understand how this worked. I know what is happenning here.

I am curious about how the a variable works. I would be really grateful if someone explained it step by step.

dimooz
6 years ago | edited 6 years ago

0

Simple as hello.

The a variable stores the server host name where the active page is hosted.
window -> the current opened webpage in your browser
window.location -> the url (web address) of this page (currently opened in your browser)
window.location.host -> the host name extracted from the url
and
+ “” -> this appends an empty string to the host name previously extracted, as explained above.

Why adding an empty text to the host name? This way you can be sure the a variable contains some text, and not an object.
window.location.host is a javascript object, that could be considered as an object if used “as is” or just as a string if you add some text to it.

KeyboardGod
6 years ago

0

[quote=dimooz][/quote]

So if there was no empty string, the b variable (a.length) wouldn’t work?

dimooz
6 years ago | edited 6 years ago

0

It works here in firefox, [s]but not sure it would work in all browser nor in all versions of them[/s].
Yes, it works. But in a general manner, if you need to operate on some text, be sure your var stores a text and nothing else. In example you could encounter same problem with digits, those could be considered as number or as text.

https://www.hackthis.co.uk/forum/level-discussion/javascript-levels/javascript-level-5/solutions/40234-couple-of-questions#latest
alert(window.location.host.length);
-> 18

KeyboardGod
6 years ago

0

I don’t know why such a simple thing (as you put it) is giving me a hard time, I appreciate all the help you gave though thanks man.

So, if I do,

a = window.location.host

Then the output is,

www.hackthis.co.uk

If I wanted to operate on the output of a, I couldn’t because the output is undefined.

But If I add,

a = window.location.host + “”

Then the output will be,

“www.hackthis.co.uk”

and, I can operate on that.

Am I correct?

dimooz
6 years ago

0

You’re absolutely right :)