JavaScript Being weird

Math.random() returns a number ONLY between 0 and 1, therefore it will always be a decimal, unless it does in fact return 0, the number 1 is not included so it will never return it. If you want to get random numbers other than what is between 0 and 1 you'll need to multiply math.random() by a number. For example if you want a random number between 0 and 10, you would do Math.random() * 10. However as you mentioned the number will be a decimal. We use Math.floor and Math.ceil to convert decimal values to integers. So to get an integer, you'd apply math.floor to it, which will round down to the nearest whole number, Math.floor(Math.random() * 10).

I think by having Math.random() limited between 0 to 1 is beneficial because from there "you can scale it to your desired range" as the MDN mentions here. If math.random() was not limited to 1 and then included numbers above that, whether decimals or integers, it would be harder to get your desired results. There are also many many many use cases in programming where you'd want your return number to be a decimal. If it only ever returned integers it would be extremely limiting in what you could do with it.

Anywho, I hope that helps clear things up some! :)

the answer of this question is

1 - || means [ or ]

2- Math.floor will round a decimal number [ down ] no matter what.

3 - Math.ceil will round a decimal number [ up ] no matter what.

all three answers , I hope help .

Thanks so much.