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Start your free trialIosif Skorohodov
1,126 PointsCan someone explain how this returns a random number between 1- 6?
function randomNumber(upper) { return Math.floor( Math.random() * upper ) + 1; } randomNumber ( 6 );
1 Answer
Steven Parker
231,124 PointsLet's look at the process step-by-step:
- by calling the function with "6" as the parameter, then "upper" will have the value of 6.
- the Math.random() function will give you a number somewhere between 0 and 1 (exclusive)
- multiplying this number by 6 will give you a number between 0 and 6 (exclusive)
- then the floor function takes away any fractional part, leaving an integer from 0 to 5 (inclusive)
- finally when you add 1 you have a number from 1 to 6
Iosif Skorohodov
1,126 PointsIosif Skorohodov
1,126 PointsIt's interesting that just spending some time away from the computer allowed me to completely understand the above.
THANK YOU SO MUCH!!!
It's so simple I feel embarrassed that I asked the question... LOL
James March
7,921 PointsJames March
7,921 PointsThanks for the thought-out and well structured response Steven. Really helpful.