For Loop Syntax

The For loop

The for loop is another type of loop exactly like while. In fact logic-wise the difference is non-existent. For is used exactly for the same purpose as while, the only thing that changes is the syntax as the image above shows.

So instead of defining the decisive variable outside the loop, we do it inside the condition, by splitting the parenthesis section into three areas.

Inside the first area we define the start of the decisive variable, at second position comes the condition we check after every iteration and last we define how we update the variable's value after iteration has finished.

This may seems to be a little bit harder at the beginning but leaves the body of the loop cleaner to put only the repeated code there.

Attention: For loops are a preferable option when we know exactly the number of iterations from before (thus is the best option when working with numbers). 

It is a good practice to use while loop when we don't know exactly the number of iterations from before.

Besides that, there is no significance difference between for and while and all the principles that we have learned in a while loop can also be applied in a for loop. (like the 'break' and 'continue' keyword).