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JavaScript

Posted by Brother Bear
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Brother Bear
Full Stack JavaScript Techdegree Student 1,129 Points

Javascript shorten the code using random numbers (confused)

rather than using math.random(input * 6) + 1

why dont we use math.random(input * 7)

we can just put a comment that its a random of 6.. can someone explain if it is right?

1 Answer

Ross King
Ross King
20,704 Points
Ross King
Ross King
20,704 Points

Hi Judson,

The reason for using +1 is in case a random number of 0 is returned. If 0 is returned you will not get a valid number e.g. 0 * 6 = 0

A use for this may be to simulate a dice roll, for example:

// Math.floor rounds down to the nearest whole number
var randomNumber = Math.floor( Math.random() * 6 ) + 1;

If you did not use +1, the dice roll may return 0 which is not valid.