Best way to randomize with a probability table

[Boba Fonts]

I'm still wondering which is the best -the most "clean"- way to achieve this: let's say I want to randomize the bonus coming out of a destroyed chest. There's a 60% it's some magic item, a 30% it's a time bonus and a 10% it's an extra life.
To date I've

-set a given "chance Value" to Random 100,
then

-if it's between 1 and 60 create the first item,

-between 61 and 90 the second,

-between 91 and 100 the third.

It certainly worked, but I'm sure there's a better way to do that! I'd like to use less and better code lines.

[nivram]

Boba. Looks good to me and its clean, but of course there are many ways that different people code. If I may suggest. Code the way you feel is comfortable. If other people get involved you will be squrming like a worm and feel uncomfortable.

[Boba Fonts]

Thank you. Glad to hear it's ok, but I was wondering if maybe some extension could help to reduce the whole thing to a couple of lines. I'm open to suggestions and I always seek help 'cause my path to master MMF2 is very long!

[nivram]

Hi again Boba. You really don't need an extension for this coding. Also, consider your path as not including extions when you do not need to for great code.

On my website examples, there are probably 150 examples not using extensions.

Marv

[Boba Fonts]

I know, but that's because you're notoriously great at coding! And the same can't be said for me.
Anyway I'll carry on my solution until it's working!
thanks

[gkinfinity]

I've personally always used a method similar to what you're using Boba. (Although I'd probably simplify the numbers for the example you used since 60, 30 and 10 are all divisible by 10. It's not at all necessary though and you're method should work just as well)

[Pixelthief]

For a more, uh, versatile system, what you should do is give each event a probability, relative to each other, then sum up the total probabilities, choose a random number in that range, and call the event that corresponds to that range. With your example, that would be probabilities of 10, 30 & 60 for 3 events. But you could easily have it be a 10, 30, 60, 50, 20 & 5 done by choosing from random(175).

Then, its possible to adjust the probabilities of each item by a weighting factor. For example, you might multiply or subtract the rarities of each item by the difference in 'level' of that item from the chest or area where it dropped. So that your 10/30/60 distribution might become an 8/36/26 distribution. That can be a useful thing if you want to have loot that is more often relevant for the level of your character, but still have everything 'spawnable'