how get 5 random number from a range which from 0 to 100?

Question

I want to generate 5 different random numbers. I have generated a range from 0 to 100. I want to pick 5 numbers from the range randomly.

Answer 1

You can generate a list of n unique random numbers in Ruby like this:

(1..99).to_a.sample(5)
=>[69, 50, 15, 68, 29]

Answer 2

a = []
while true
   a << rand(101) # if you want to get 100
   break if a.uniq.count == 5
end

it can get 5 different random number.

Answer 3

You can also try something like this:

arr = []
(1..5).each{|t| arr << rand(100)}
arr
#=> [78, 19, 34, 96, 59]

This array may contain repeated elements as pointed out by @p11y in comments.

Here's the fix to that (inspired by his comments):

a = 5.times.map { rand(100) }
until a.uniq.size==5 do
 a += (5-a.uniq.size).times.map{rand (100)}
end 
a.uniq!

I think there are better solutions already posted here, this is just an alternative answer.