Welcome to the Treehouse Community
The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.
I have never encountered any zero when using Math.ceil
But why does the teacher use Math.floor and extra code to get the number between 1 - 6?
var randomNumber = Math.floor( Math.random() * 6) + 1;
He said Math.ceil might give you zero sometimes, but I never encountered zero. Math.random() always returns greater value than zero, as long as the value is not less than zero, Math.ceil returns the value of 1.
Code I tried:
var randomNumber = Math.ceil( Math.random() * 6);
Both are working exactly the same way, but I'm confused why the teacher has used Math.floor? Please help
Math.random() will return a random number between 0 (inclusive) and 1 (exclusive). Might be you are too lucky that you never meet a 0 value from Math.random(). When Math.random() gives you a 0 value:
Math.floor( Math.random() * 6) + 1 = Math.floor( 0 * 6) + 1 = 0 + 1 = 1
Thus, if you really want to value from 1 to 6. The above formula will be the only answer.
For Math.ceil( Math.random() * 6), when Math.random() gives you a 0 value:
Math.ceil( Math.random() * 6) = Math.ceil(0 * 6) = Math.ceil(0) = 0
You might have a chance getting a zero value but not 1 to 6 only.