Question

I have a question about this script I found and used. It works but I don’t get why. The exercise was to make a list with random numbers from -50 to 50. The function below uses Math.floor(Math.random() * (the part i dont understand).

If I put this calculation on google I got as answer 151 and Math.random()*151 does not do from -50 to 50.

Can someone give me a clear explanation about this function below because I am sure that I am missing something.

this script works but I only want a clear explanation how

for (i = 0; i <= 100; i++)
{
    Rnumber[i] = randomFromTo(-50,50);
}

function randomFromTo(from, to)
{
    return Math.floor(Math.random() * (to - from + 1) + from);
}

Answer 1

to - from + 1 = 50 - (-50) + 1 = 101
Math.random() * 101 = number in range [0,101[
Math.floor([0,101[) = integer in range [0,100]
[0,100] + from = [0,100] + (-50) = integer in range [-50,50]

Which is exactly what is asked for.