I tried this function to find a random int number between two bonds, I know the method of Math.floor () and Math.random() how works, but I could not understand the logic with this function (max-min + 1) and the addition of min. why do we need to use (max-min+1) then the addition ofmin?
function random(min, max) {
const num = Math.floor(Math.random() * (max - min + 1)) + min;
return num;
}
console.log(random(5, 10));
>Solution :
The purpose of (max - min + 1) is to determine the total number of possible values within the specified range, and it ensures that when you multiply it by Math.random(), you consider all the integers within that range. Adding 1 is crucial to include the upper bound of the range.
For example, if you want to generate random numbers between 3 and 6 (inclusive). The range is 3, 4, 5, 6. If you only calculate (max - min), it would be (6 - 3), which equals 3. Without adding 1, you would have a range of 3 different values (3, 4, 5), and the upper bound (6) would be excluded.
By adding 1 to the calculation (max - min), you get (6 – 3 + 1), which equals 4. Now, you have a range of 4 different values (3, 4, 5, 6), including the upper bound.