aprell/gotcha.lua

Last active October 7, 2019 13:14

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Another Lua gotcha

Raw

	function f()
	return 1, 2, 3
	end

	print(f()) -- 1 2 3
	print(f(), 4) -- 1 4
	print(4, f()) -- 4 1 2 3

Author

aprell commented Oct 7, 2019

Documented in Section 3.4 of the Lua Reference Manual:

If an expression is used as the last (or the only) element of a list of expressions, then no adjustment is made (unless the expression is enclosed in parentheses). In all other contexts, Lua adjusts the result list to one element, either discarding all values except the first one or adding a single nil if there are no values.

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