Data commit

Task/Call-an-object-method/Lua/call-an-object-method-1.lua

@@ -0,0 +1,4 @@
+local object = { name = "foo", func = function (self) print(self.name) end }
+
+object:func() -- with : sugar
+object.func(object) -- without : sugar

Task/Call-an-object-method/Lua/call-an-object-method-2.lua

@@ -0,0 +1,9 @@
+local methods = { }
+function methods:func () -- if a function is declared using :, it is given an implicit 'self' parameter
+    print(self.name)
+end
+
+local object = setmetatable({ name = "foo" }, { __index = methods })
+
+object:func() -- with : sugar
+methods.func(object) -- without : sugar

Task/Call-an-object-method/Lua/call-an-object-method-3.lua

@@ -0,0 +1,16 @@
+local count = 0
+local box = { }
+local boxmt = { __index = box }
+function box:tellSecret ()
+    return self.secret
+end
+
+local M = { }
+function M.new ()
+    count = count + 1
+    return setmetatable({ secret = count, contents = count % 2 == 0 and "rabbit" or "rock" }, boxmt)
+end
+function M.count ()
+    return count
+end
+return M

Task/Call-an-object-method/Lua/call-an-object-method-4.lua

@@ -0,0 +1,6 @@
+local box = require 'box'
+
+local b = box.new()
+
+print(b:tellSecret())
+print(box.count())