helpers.lua

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-- Helper functions

-- Create a set where membership can be checked by set_name[potential_member]
function Set (array)
    local set = {}
    for _, l in ipairs(array) do
        set[l] = true
    end
    return set
end

-- Get the length of an array
function Length(array)
    local count = 0
    for _, l in ipairs(array) do
        count  = count + 1
    end
    return count
end