On Tue, Feb 28, 2012 at 8:03 PM, Valery Kvon <adda...@gmail.com> wrote:
> On 29.02.2012, at 4:10, John Merlino wrote:
>
>> Hey all, using ruby 1.8.7, I wrote this:
>>
>> 500.times.map { Integer((rand * 1) * 1000) / Float(1000) }
>>
>> Basically, this gives me a list of 500 random decimal numbers that are
>> rounded to 3 places. However, I also want to make sure that all are
>> unique.
>
> .uniq() doesn't guarentee 500 number exactly.
> .shuffle() just tosses the collection and doesn't give you unique numbers.
>
> You'd better to implement method:
>
> def secure(number, precision)
> collection = []
> collection |= [SecureRandom.random_number.round(precision)] while
> collection.size < number
> collection
> end
>
>> secure(500, 3)
> => collection of 500 unique random numbers.
>
Sweet!
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