return {

-- Helper function to check if value passed by parameter is a table

-- @obj {table}

-- @returns {boolean}

is_table = function(obj)

return type(obj) == 'table'

end,

-- Raises error if @param is not an array

-- @obj {table}

-- @param {table}

-- @method {string}

-- @returns {void}

raises_error = function(obj, param, method)

assert(obj.is_array(param), string.format('%s expects an array', method))

end,

-- Returns lowest value between two values

-- @a {number}

-- @b {number}

-- @returns number

lowest_value = function(a, b)

return a < b and a or b

end,

-- Makes multiple inserts in a table (array-like)

-- @obj {table}

-- @values {table}

-- @returns {void}

multiple_inserts = function(obj, values)

for i=1, #values do

local value = values[i]

table.insert(obj, value)

end

end,

-- Convert array to hash table

-- @obj {table}

-- @returns {table}

convert_to_hash = function(obj)

local output = {}

for i=1, #obj do

local value = obj[i]

output[value] = true

end

return output

end,

-- Loop through table and print all values

-- @obj {table}

-- @returns {nil}

print_items = function(obj)

for i=1, #obj do

print(obj[i])

end

end,

-- Checks wether value is nil

-- @obj {any}

-- @returns {boolean}

is_nil = function(value)

return value == nil

end

}