How to duplicate value of array in ruby

Question

I have two arrays of integers, e.g.

a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] 
b = [7, 8, 9]

I would like to repeatedly duplicate the value of 'b' to get a perfectly matching array lengths like this:

   a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]   
   b = [7, 8, 9, 7, 8, 9, 7, 8, 9, 7]

We can assume that a.length > b.length

Answer 1

Assuming you mean

a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] 
b = [7, 8, 9]

then you can do:

b.cycle.take(a.length) #=> [7, 8, 9, 7, 8, 9, 7, 8, 9, 7]

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See Array#cycle and Enumerable#take for more details.