Module:table/sparseArray

local export = {}

local libraryUtil = require('libraryUtil')

local checkType = libraryUtil.checkType

function export.isPositiveInteger(v) if type(v) == 'number' and v >= 1 and math.floor(v) == v and v < math.huge then return true else return false end end

function export.numKeys(t) checkType('numKeys', 1, t, 'table') local isPositiveInteger = export.isPositiveInteger local nums = {} for k, v in pairs(t) do		if isPositiveInteger(k) then nums[#nums + 1] = k		end end table.sort(nums) return nums end

function export.compressSparseArray(t) checkType('compressSparseArray', 1, t, 'table') local ret = {} local nums = export.numKeys(t) for _, num in ipairs(nums) do		ret[#ret + 1] = t[num] end return ret end

return export