Ruby on Rails

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.

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