Switch expression statement for Lua

This package provides simple function named "switch" which could be used to emulate switch statement which does not exist in Lua but does in other languages. It can handle default fallback.

Installation

Via LuaRocks:

luarocks install lua-switch

Or just download and require init.lua file from this repo.

Usage

Just require it in the code like in the example below:

local switch, default = require "lua-switch"()
local var = "b"
switch (var) {
	a = 1; -- Use string key
	[1] = 2; -- Or numeric one
	[{"b", "c"}] = function () -- Use multiple values. Mostly functions will be used as code block
		print "Switch!" -- Prints "Switch!"
	end;
	[default] = function () -- Use default fallback
		var = 12
	end
}
-- Or even use it as expression
local var = switch "b" {
	a = 1;
	b = 2;
	c = 3;
	d = function ()
		return 4; -- If you wish you can also use function blocks and return values from them
	end;
}
print(var) -- Prints "2"

Testing

Install luaunit package:

luarocks install luaunit

Then run from the console:

lua test.lua

Make sure that luaunit package can be required using package.path variable.