Gets the next index and its value of the table table starting at index. If index is nil, then it returns an initial index and value. This function returns nil if called with the last index or table is nil. However, the order that indices are returned are not in order, even if table has numerical indices.

ExampleCheck if a table is empty

Errors if table is empty, or prints the table's contents.

Code

local t1 = {}
if next(t1) then
  print(textutils.serialize(t1))
else
  error("empty table", 2)
end

Output

program.lua:4:empty table

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next Function
Syntax next( table : table index? : various )
Returns	various index, various value
API	Base globals
Source	CC:Tweaked