How much do you know about JavaScript?

like the the example "var price = 28.99;" what mean this and the replay was "this code Create a variable named price, and assign the value 28.99 to it." for all same what dose mean for JavaScript Code

JavaScript Code	What does it Mean? Take a guess
var price = 28.99;	Create a variable named price, and assign the value 28.99 to it.
var discount = 10;
var total =
price - (price * (discount / 100));
if (total > 25) {
freeShipping();
}
var count = 10;
while (count > 0) {
juggle();
count = count - 1;
}
var dog = {name: "Rover", weight: 35};
if (dog.weight > 30) {
alert("WOOF WOOF");
} else {
alert("woof woof");
}
var circleRadius = 20;
var circleArea =
Math.PI * (circleRadius * circleRadius);