Why are you adding capital letter to your variables? For example var secondsPerMin=60; Is there any reason for capitals?

Actually, these are not constants. Constants in JavaScript can take any legal identifier, and as is the common practice in other languages, it's easiest to use CAPS when naming constants so we know the difference between them and normal variables. The only difference between constants and variables is that constants are declared like this:

const CONSTANT_NAME = 10;

while variables are declared like this:

var variableName = 5;

Notice the only real difference is the use of leading const and var keywords.

What the original question is asking, I believe, is about the use of camelCaps. CamelCaps are a convention for naming variables in Javascript (and other languages, I assume). This is done because it is easier to read. Sometimes variable names are short or one word, like x or sum, but when you need a more descriptive variable name like currentSum or playerOneCurrentScore, using camel caps makes identifying and reading them much easier.

For example, the following two variable names are identical and are both allowed in JavaScript, but the second is much easier to read in my opinion:

var currentuserlastnamewithtitle = "Mr. Field";
var currentUserLastNameWithTitle = "Mr. Smith";

Okey great, good to know! Thanks everybody for the answers!:)

Hi Verhoef, the above variable naming convention is called the 'camelcasing' naming convention. It is called so because it looks like the humps on the back of a camel. Camel case is also in my experience one of the most used variable naming conventions. I hope that helps. Cheers.