Question

I don't understand something Why Math.floor(Math.random() * 10) + 1; returns a random integer from 1 to 10? and  Math.floor(Math.random() * 11);   returns a random integer from 0 to 10 not 11?    Math.floor(Math.random() * 10) + 5 gives you a number like 12?   Why they are different from each other and they have the same attribute?

Is there a formula for that, I want a full explanation please?

Answer 1

Math.random() will generate a random number between 0 to 1 so if we multiply with 10 it will random number between 0-9.9999 so if if we do floor() than it will random number between 0-9

in first case Math.floor(Math.random() * 10) + 1

here you will get random numbers from 1-10 because Math.floor(Math.random() * 10) will give you 0-9 for that your adding 1 so it will be 1-10

Math.floor(Math.random() * 11); it will gie 0-10.999 as your using floor it will make 1-10 only and your not adding +1 here if you add you will get 1-11

Math.floor(Math.random() * 10) + 5: here you wll get 5-14

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