CODEWITHSUNDEEP
ruby
Charles
Charles

Reputation: 71

How to check if there's a repeat?

    randomized = 10.times.map { Random.new.rand(1..100) }

I wanted to make 10 randomized numbers that do not repeat twice. How do I check it? I don't want to do the long one such as

    puts randomized[0] != randomized[1]
    puts randomized[1] != randomized[2]

Upvotes: 0

Views: 60

Answers (2)

steenslag
steenslag

Reputation: 80085

Array#sample takes an argument:

randomized = (1..100).to_a.sample(10) #=> [52, 100, 92, 93, 33, 66, 78, 84, 36, 98]

From the docs: " The elements are chosen by using random and unique indices into the array in order to ensure that an element doesn’t repeat itself unless the array already contained duplicate elements."

Upvotes: 6

user1875195
user1875195

Reputation: 988

You could just shuffle and array of the given set to guarantee no dups. 

randomized = (1..100).to_a.shuffle

You can then just pop them off 

next_r = randomized.pop

Upvotes: 2

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