Question

I am learning HTML 5 game programming. I encounter a code that

var pingpong = {};
pingpong.pressedKeys = [];

$(function(){

    pingpong.timer = setInterval(gameloop,30);

    function gameloop() {
        movePaddles();

    } //end of gameloop()

}); //end of $(fn)

Then author says that

We have a timer to execute some game-related code every 30 milliseconds, so this 
code is executed 33.3 times per second.

I want to ask that how it is 33.3 times per second? How can we calculate it ?

Thanks

Answer 1

A second is 1000 milliseconds, and setInterval(gameloop, 30) makes sure the code runs every 30 milliseconds, thus, 1000 / 30 = 33.3.