Question

Doing a very simple loop to display various data,

for _test in @test …

I want to be able to,

1) get the first value _test.name.first()???

2) get the previous value(meaning, the last iteration, so I i iterated the first time, I want to grab it again, when its in the second loop

Thank you

— update

What I mean is this

1. Doug, 2. Paul 3.Steve

So when I have Paul as the current name, I want to be able to get the last iteration (Doug) and same with Steve (get Paul)….So like an array, get the last, first but in this case the previous value

Answer 1

Here’s a hacky but straightforward way to do it:

prev = nil
first = nil
(1..10).each do |i|
    if !prev.nil? then
        puts "#{first} .. #{prev} .. #{i}"
        prev = i
    elsif !first.nil? then
        puts "#{first} .. #{i}"
        prev = i
    else
        puts i
        first = i
    end
end

Output:

1
1 .. 2
1 .. 2 .. 3
1 .. 3 .. 4
1 .. 4 .. 5
1 .. 5 .. 6
1 .. 6 .. 7
1 .. 7 .. 8
1 .. 8 .. 9
1 .. 9 .. 10