All Questions

2
answers

What is HMAC?

When working on a project that uses sha256 and security keys, I came across the term hmac . I still do not really know what it's all about, and I'd like to understand a bit more. I have the following questions: What would an HM...
asked on 14.03.2017 / 17:40
4
answers

How to round to the nearest ten?

How can I round off a number to the nearest ten in JavaScript? For example: The user types 11, there it would round to 20; the user types 11.5, would round to 20; and so on.     
asked on 05.01.2014 / 00:36
2
answers

What are the operators | &?

I was analyzing a code and found some operators I do not know about: | , & , >> and% with%. What is the functionality of these operators? bits = h1 << 18 | h2 << 12 | h3 << 6 | h4; o1 = bits &g...
asked on 04.03.2015 / 14:28
3
answers

What is SQL? How to use?

I already know at least that SQL is related to the database, with the query of values in the database. But it is not clear what would be the SQL. What would you use this resource for? And how do you use SQL, for example in a user system?  ...
asked on 28.06.2014 / 03:44
2
answers

What are AMD and CommonJS?

Recently I've heard a lot about Asynchronous Module Definition (AMD) and CommonJS. They look like two trendy terms. I read a few things about it, but I'm still confused. AMD and CommonJS are libraries or specifications? Who can explain...
asked on 25.07.2014 / 16:52
3
answers

What is Google Polymer?

I've seen some recent studies on foreign websites about this Google Polymer , but I still do not understand where it should be used, for example in a mobile application. I did not find Brazilian blogs or websites containing information about...
asked on 06.07.2014 / 02:11
3
answers

What are the main differences between VB.Net and C #?

In addition to the syntax, what are the main differences between these two languages? Is there any performance difference between them? Or is there a case in which it is extremely advisable to use one language and not the other, or is VB.Net...
asked on 22.02.2015 / 18:31
6
answers

Android apps development: what tools and language to start a project?

I'd like to venture into creating apps for Android. At first I would make one just for my own use. What tools would I need to set up my development environment? My application would use database, is there any more recommended? And the lang...
asked on 06.02.2014 / 14:33
2
answers

What is a context on Android?

What is a context on Android? What is the difference between getContext() , getApplicationContext() , getBaseContext() ? Is it related to getActivity?     
asked on 01.11.2014 / 00:07
5
answers

JS Mask for Validation of Hours

I'm using jQuery Masked Input in a project. I made a mask like this: <script> $(document).ready(function () { $("#QuantidadeHoras").mask("99:99"); }); </script> The <input> only lets me fill in the...
asked on 25.06.2015 / 02:36