User:SuzannaLinn Resident/LuaLanguage2 - Revision history

SuzannaLinn Resident at 09:18, 8 November 2024

2024-11-08T09:18:38Z

← Older revision		Revision as of 02:18, 8 November 2024
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	LuaSL will add the ll library with all the ll functions, like: ll.Say, ll.GetPos,..		LuaSL will add the ll library with all the ll functions, like: ll.Say, ll.GetPos,..

			Libraries are accessed through tables. They are implemented as tables with functions and constants.

			We can list the contents of a library:

			<syntaxhighlight lang="lua" line copy>
			-- Contents of a library (Lua)

			for name, entry in pairs(math) do
			print(type(entry)," ",name)
			end
			</syntaxhighlight>

SuzannaLinn Resident at 15:07, 4 October 2024

2024-10-04T15:07:22Z

@@ Line 441: / Line 441: @@
 -- print(myBalloon._color)  -- This works but shouldn't be done
 </syntaxhighlight>
@@ Line 619: / Line 630: @@
 -- Thor has 55 health remaining.
 </syntaxhighlight>
@@ Line 663: / Line 677: @@
 myGuitar:tune()
 </syntaxhighlight>

SuzannaLinn Resident at 14:10, 4 October 2024

2024-10-04T14:10:16Z

← Older revision		Revision as of 07:10, 4 October 2024
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	function PartyBalloon:displayInfo()		function PartyBalloon:displayInfo()
	print("Color: "..self._color..", Size: "..self._size..", Inflated: "..tostring(self._isInflated))		print("Color: "..self._color..", Size: "..self._size..", Inflated: "..tostring(self._isInflated))
	end		end

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	end		end

	~~local~~ myBalloon = PartyBalloon:new("Green", "Large")		myBalloon = PartyBalloon:new("Green", "Large")

	myBalloon:displayInfo() -- Color: Red, Size: Large, Inflated: false		myBalloon:displayInfo() -- Color: Red, Size: Large, Inflated: false
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	-- Objects and abstract classes		-- Objects and abstract classes

	~~local~~ AbstractInstrument = {}		AbstractInstrument = {}

	function AbstractInstrument.new()		function AbstractInstrument.new()
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	end		end

	~~local~~ Guitar = {}		Guitar = {}
	Guitar.__index = Guitar		Guitar.__index = Guitar

SuzannaLinn Resident at 14:06, 4 October 2024

2024-10-04T14:06:38Z

Show changes

SuzannaLinn Resident at 13:19, 4 October 2024

2024-10-04T13:19:57Z

← Older revision		Revision as of 06:19, 4 October 2024
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	end		end

	~~local~~ add, mul = calculate(10, 5)		add, mul = calculate(10, 5)
	print("Sum:", add) -- Sum: 15		print("Sum:", add) -- Sum: 15
	print("Product:", mul) -- Product: 50		print("Product:", mul) -- Product: 50
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	end		end

	~~local~~ add, mul = calculate(10, 5, 2, 3)		add, mul = calculate(10, 5, 2, 3)
	print("Sum:", add) -- Sum: 20		print("Sum:", add) -- Sum: 20
	print("Product:", mul) -- Product: 300		print("Product:", mul) -- Product: 300
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	print( readOnlyFruits[5] ) -- nil		print( readOnlyFruits[5] ) -- nil
	</syntaxhighlight>		</syntaxhighlight>
	~~Now we~~ are going to see how to make a read only table using a metatable.		We are going to see how to make a read only table using a metatable.

	A metatable is a table that is linked to another table and has keys to control how the table works.		A metatable is a table that is linked to another table and has keys to control how the table works.
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	Vector.__index = Vector		Vector.__index = Vector

	function Vector.new(x, y, z)		function Vector:new(x, y, z)
	local ~~self~~ = setmetatable({}, Vector)		local instance = setmetatable({}, Vector)
	~~self~~.x = x		instance.x = x
	~~self~~.y = y		instance.y = y
	~~self~~.z = z		instance.z = z
	return ~~self~~		return instance
	end		end

	function Vector.__add(v1, v2)		function Vector.__add(v1, v2)
	return Vector.new(v1.x + v2.x, v1.y + v2.y, v1.z + v2.z)		return Vector:new(v1.x + v2.x, v1.y + v2.y, v1.z + v2.z)
	end		end

	function Vector.__sub(v1, v2)		function Vector.__sub(v1, v2)
	return Vector.new(v1.x - v2.x, v1.y - v2.y, v1.z - v2.z)		return Vector:new(v1.x - v2.x, v1.y - v2.y, v1.z - v2.z)
	end		end

	function Vector.__mul(v1, v2)		function Vector.__mul(v1, v2)
	if type(v2) == "number" then		if type(v2) == "number" then
	return Vector.new(v1.x * v2, v1.y * v2, v1.z * v2)		return Vector:new(v1.x * v2, v1.y * v2, v1.z * v2)
	else		else
	return v1.x * v2.x + v1.y * v2.y + v1.z * v2.z		return v1.x * v2.x + v1.y * v2.y + v1.z * v2.z
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	end		end

	v1 = Vector.new(1, 2, 3)		v1 = Vector:new(1, 2, 3)
	v2 = Vector.new(4, 5, 6)		v2 = Vector:new(4, 5, 6)

	print("v1:", v1) -- v1: <1, 2, 3>		print("v1:", v1) -- v1: <1, 2, 3>
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	In our example, Vector is the class, v1 and v2 are the instances.		In our example, Vector is the class, v1 and v2 are the instances.

	We start defining Vector as a table, line 3, with __index assigned to itself.		We start defining Vector as a table, line 3, with __index assigned to itself.

	It means that when the instance doesn't find a key in its table (which will happen with the functions of the class), it will look for it in the Vector table (which has the functions).		It means that when the instance doesn't find a key in its table (which will happen with the functions of the class), it will look for it in the Vector table (which has the functions).

	The function "new", lines 6-12, is the constructor. We could use any name for it, but "new" is the usual one.		The function "new", lines 6-12, is the constructor. We could use any name for it, but "new" is the usual one.

SuzannaLinn Resident at 11:24, 3 October 2024

2024-10-03T11:24:33Z

← Older revision		Revision as of 04:24, 3 October 2024
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	In case of error, the second parameter is the description of the error.		In case of error, the second parameter is the description of the error.


	== Libraries ==		== Libraries ==
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	LuaSL will add the ll library with all the ll functions, like: ll.Say, ll.GetPos,..		LuaSL will add the ll library with all the ll functions, like: ll.Say, ll.GetPos,..


	== Modules and packages ==		== Modules and packages ==
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	Standard Lua also has packages, which have several modules compiled together, but Luau has modules only.		Standard Lua also has packages, which have several modules compiled together, but Luau has modules only.


	== Debugging ==		== Debugging ==

SuzannaLinn Resident at 11:23, 3 October 2024

2024-10-03T11:23:09Z

← Older revision		Revision as of 04:23, 3 October 2024
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	for _, fruit in ipairs( sortFruits() ) do		for _, fruit in ipairs( sortFruits() ) do
	print( fruit.name .. ": " .. fruit.quantity )		print( fruit.name..": "..fruit.quantity )
	-- Apple: 50		-- Apple: 50
	-- Banana: 30		-- Banana: 30

SuzannaLinn Resident at 11:21, 3 October 2024

2024-10-03T11:21:05Z

← Older revision		Revision as of 04:21, 3 October 2024
Line 125:		Line 125:

	And we have added a counter to see how many comparisons it needs.		And we have added a counter to see how many comparisons it needs.


			== Sorting dictionary tables ==
			<syntaxhighlight lang="lua" line copy>
			-- Sorting dictionary tables

			fruitQuantity = {
			Apple = 50,
			Banana = 30,
			Cherry = 20,
			Orange = 15,
			Lemon = 20,
			Pear = 30,
			Melon = 15
			}

			function sortFruits()
			local arrayFruits = {}

			for name, quantity in pairs( fruitQuantity ) do
			table.insert( arrayFruits, {name = name, quantity = quantity} )
			-- tablename.key acces used above, tablename["key"] would be:
			-- table.insert( arrayFruits, { ["name"] = name, ["quantity"] = quantity} )
			end

			table.sort( arrayFruits, function(a, b)
			if a.quantity ~= b.quantity then
			return a.quantity > b.quantity
			else
			return a.name < b.name
			end
			end )

			return arrayFruits
			end

			for _, fruit in ipairs( sortFruits() ) do
			print( fruit.name .. ": " .. fruit.quantity )
			-- Apple: 50
			-- Banana: 30
			-- Pear: 30
			-- Cherry: 20
			-- Lemon: 20
			-- Melon: 15
			-- Orange: 15
			end
			</syntaxhighlight>
			We have seen before that the keys in a dictionary table are not sorted.

			In this example we are using another table, an array table, to sort the fruits by quantity and name.

			We create the new array table of tables with name and quantity in lines 14-20.

			We sort the table in lines 22-28, by quantity and name.

			The _ in the for in line 33 is a variable name. It stores the index of the array returned by ipairs, that we don't use. Using _ is a convention to denote an unused variable.

SuzannaLinn Resident: /* Modules and packages */

2024-10-01T18:23:21Z

Modules and packages

← Older revision		Revision as of 11:23, 1 October 2024
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	A module is a type of script that is not executed on its own, but will be included in another script.		A module is a type of script that is not executed on its own, but will be included in another script.

	Modules return a table that will used in the main script. This table can be anything: values and functions, an object, several objects...		Modules return a table that will be used in the main script. This table can be anything: values and functions, an object, several objects...

	Standard Lua also has packages, which have several modules compiled together, but Luau has modules only.		Standard Lua also has packages, which have several modules compiled together, but Luau has modules only.


	== Debugging ==		== Debugging ==

SuzannaLinn Resident: /* Libraries */

2024-10-01T18:22:57Z

Libraries

← Older revision		Revision as of 11:22, 1 October 2024
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	== Libraries ==		== Libraries ==

	~~system~~ functions are grouped in libraries, and called as LibraryName.FunctionName, except the functions in the basic library that doesn't need a library name.		System functions are grouped in libraries, and called as LibraryName.FunctionName, except the functions in the basic library that doesn't need a library name.

	We have seen several basic functions, like: print, type, tostring, pairs, select, setmetatable,... Other libraries are:		We have seen several basic functions, like: print, type, tostring, pairs, select, setmetatable,... Other libraries are:
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	LuaSL will add the ll library with all the ll functions, like: ll.Say, ll.GetPos,..		LuaSL will add the ll library with all the ll functions, like: ll.Say, ll.GetPos,..


	== Modules and packages ==		== Modules and packages ==