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Merge pull request #306 from hoelzro/master

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A few clarifications for the Lua documentation
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Adam Bard 2013-09-04 09:07:18 -07:00
commit bc12c626c8
1 changed files with 11 additions and 4 deletions
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lua.html.markdown
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@ -125,6 +125,9 @@ f = function (x) return x * x end
-- And so are these: -- And so are these:
local function g(x) return math.sin(x) end local function g(x) return math.sin(x) end
local g = function(x) return math.xin(x) end
-- Equivalent to local function g(x)..., except referring
-- to g in the function body won't work as expected.
local g; g = function (x) return math.sin(x) end local g; g = function (x) return math.sin(x) end
-- the 'local g' decl makes g-self-references ok. -- the 'local g' decl makes g-self-references ok.
@ -133,6 +136,10 @@ local g; g = function (x) return math.sin(x) end
-- Calls with one string param don't need parens: -- Calls with one string param don't need parens:
print 'hello' -- Works fine. print 'hello' -- Works fine.
-- Calls with one table param don't need parens
-- either (more on tables below):
print {} -- Works fine too.
---------------------------------------------------- ----------------------------------------------------
-- 3. Tables. -- 3. Tables.
@ -203,7 +210,7 @@ f2 = {a = 2, b = 3}
metafraction = {} metafraction = {}
function metafraction.__add(f1, f2) function metafraction.__add(f1, f2)
sum = {} local sum = {}
sum.b = f1.b * f2.b sum.b = f1.b * f2.b
sum.a = f1.a * f2.b + f2.a * f1.b sum.a = f1.a * f2.b + f2.a * f1.b
return sum return sum
@ -266,7 +273,7 @@ eatenBy = myFavs.animal -- works! thanks, metatable
Dog = {} -- 1. Dog = {} -- 1.
function Dog:new() -- 2. function Dog:new() -- 2.
newObj = {sound = 'woof'} -- 3. local newObj = {sound = 'woof'} -- 3.
self.__index = self -- 4. self.__index = self -- 4.
return setmetatable(newObj, self) -- 5. return setmetatable(newObj, self) -- 5.
end end
@ -301,7 +308,7 @@ mrDog:makeSound() -- 'I say woof' -- 8.
LoudDog = Dog:new() -- 1. LoudDog = Dog:new() -- 1.
function LoudDog:makeSound() function LoudDog:makeSound()
s = self.sound .. ' ' -- 2. local s = self.sound .. ' ' -- 2.
print(s .. s .. s) print(s .. s .. s)
end end
@ -322,7 +329,7 @@ seymour:makeSound() -- 'woof woof woof' -- 4.
-- If needed, a subclass's new() is like the base's: -- If needed, a subclass's new() is like the base's:
function LoudDog:new() function LoudDog:new()
newObj = {} local newObj = {}
-- set up newObj -- set up newObj
self.__index = self self.__index = self
return setmetatable(newObj, self) return setmetatable(newObj, self)