Downloaded 37 times
![@etiene_dTopConf Tallinn 2015
Tables
local a = { 1, 3, 5, 7, 9}
local sum = 0
for i=1,#a do
sum = sum + a[i]
end
print(sum) -- 25](https://image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-30-2048.jpg)
![@etiene_dTopConf Tallinn 2015
local a = { 1, 3, 5, 7, 9}
local sum = 0
for i=1,#a do
sum = sum + a[i]
end
print(sum) -- 25
Tables
local a = {}
a[1] = 1
a[2] = 3 -- etc
local sum = 0
for _, x in ipairs(a) do
sum = sum + x
end
print(sum)](https://image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-31-2048.jpg)
![@etiene_dTopConf Tallinn 2015
local a = { 1, 3, 5, 7, 9}
local sum = 0
for i=1,#a do
sum = sum + a[i]
end
print(sum) -- 25
local a, x = 10, “y”
local point = { x = a, y = 25}
print(point[“x”], point[“y”]) -- 10 25
print(point[x], point[y]) -- 25 nil
print(point.x, point.y) -- 10 25
Tables](https://image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-32-2048.jpg)
![@etiene_dTopConf Tallinn 2015
local a = { 1, 3, 5, 7, 9}
local sum = 0
for i=1,#a do
sum = sum + a[i]
end
print(sum) -- 25
local a, x = 10, “y”
local point = { x = a, y = 25}
print(point[“x”], point[“y”]) -- 10 25
print(point[x], point[y]) -- 25 nil
print(point.x, point.y) -- 10 25
-- sets and multisets
local ips = { “5.101.112.0” = true, “213.35.128.0” = true }
local connections = { “5.101.112.0” = 5, “213.35.128.0” = 2 }
Tables](https://image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-33-2048.jpg)
![@etiene_dTopConf Tallinn 2015
-- Cipher module
--[[ Based on algorithms/caesar_cipher.lua
by Roland Yonaba ]]
local cipher = {}
local function ascii_base(s)
return s:lower() == s and ('a'):byte() or ('A'):byte()
end
function cipher.caesar( str, key )
return str:gsub('%a', function(s)
local base = ascii_base(s)
return string.char(((s:byte() - base + key) % 26) + base)
end)
end
return cipher
Modules](https://image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-34-2048.jpg)
![@etiene_dTopConf Tallinn 2015
-- Cipher module
--[[ Based on algorithms/caesar_cipher.lua
by Roland Yonaba ]]
local cipher = {}
local function ascii_base(s)
return s:lower() == s and ('a'):byte() or ('A'):byte()
end
function cipher.caesar( str, key )
return str:gsub('%a', function(s)
local base = ascii_base(s)
return string.char(((s:byte() - base + key) % 26) + base)
end)
end
return cipher
Modules](https://image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-35-2048.jpg)
![@etiene_dTopConf Tallinn 2015
-- Cipher module
--[[ Based on algorithms/caesar_cipher.lua
by Roland Yonaba ]]
local cipher = {}
local function ascii_base(s)
return s:lower() == s and ('a'):byte() or ('A'):byte()
end
function cipher.caesar( str, key ) --cipher.caesar = function(str,key)
return str:gsub('%a', function(s)
local base = ascii_base(s)
return string.char(((s:byte() - base + key) % 26) + base)
end)
end
return cipher
Modules
public](https://image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-36-2048.jpg)
![@etiene_dTopConf Tallinn 2015
-- Cipher module
--[[ Based on algorithms/caesar_cipher.lua
by Roland Yonaba ]]
local cipher = {}
local function ascii_base(s)
return s:lower() == s and ('a'):byte() or ('A'):byte()
end
function cipher.caesar( str, key )
return str:gsub('%a', function(s)
local base = ascii_base(s)
return string.char(((s:byte() - base + key) % 26) + base)
end)
end
return cipher
Modules
private](https://image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-37-2048.jpg)
![@etiene_dTopConf Tallinn 2015
-- Cipher module
--[[ Based on algorithms/caesar_cipher.lua
by Roland Yonaba ]]
local cipher = {}
local function ascii_base(s)
return s:lower() == s and ('a'):byte() or ('A'):byte()
end
function cipher.caesar( str, key )
return str:gsub('%a', function(s)
local base = ascii_base(s)
return string.char(((s:byte() - base + key) % 26) + base)
end)
end
return cipher
Modules
local cipher = require “cipher”
print(cipher.caesar(“test”,3) -- whvw](https://image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-38-2048.jpg)
![@etiene_dTopConf Tallinn 2015
Tables
local a = { 1, 3, 5, 7, 9}
local sum = 0
for i=1,#a do
sum = sum + a[i]
end
print(sum) -- 25](https://crownmelresort.com/image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-30-2048.jpg)
![@etiene_dTopConf Tallinn 2015
local a = { 1, 3, 5, 7, 9}
local sum = 0
for i=1,#a do
sum = sum + a[i]
end
print(sum) -- 25
Tables
local a = {}
a[1] = 1
a[2] = 3 -- etc
local sum = 0
for _, x in ipairs(a) do
sum = sum + x
end
print(sum)](https://crownmelresort.com/image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-31-2048.jpg)
![@etiene_dTopConf Tallinn 2015
local a = { 1, 3, 5, 7, 9}
local sum = 0
for i=1,#a do
sum = sum + a[i]
end
print(sum) -- 25
local a, x = 10, “y”
local point = { x = a, y = 25}
print(point[“x”], point[“y”]) -- 10 25
print(point[x], point[y]) -- 25 nil
print(point.x, point.y) -- 10 25
Tables](https://crownmelresort.com/image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-32-2048.jpg)
![@etiene_dTopConf Tallinn 2015
local a = { 1, 3, 5, 7, 9}
local sum = 0
for i=1,#a do
sum = sum + a[i]
end
print(sum) -- 25
local a, x = 10, “y”
local point = { x = a, y = 25}
print(point[“x”], point[“y”]) -- 10 25
print(point[x], point[y]) -- 25 nil
print(point.x, point.y) -- 10 25
-- sets and multisets
local ips = { “5.101.112.0” = true, “213.35.128.0” = true }
local connections = { “5.101.112.0” = 5, “213.35.128.0” = 2 }
Tables](https://crownmelresort.com/image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-33-2048.jpg)
![@etiene_dTopConf Tallinn 2015
-- Cipher module
--[[ Based on algorithms/caesar_cipher.lua
by Roland Yonaba ]]
local cipher = {}
local function ascii_base(s)
return s:lower() == s and ('a'):byte() or ('A'):byte()
end
function cipher.caesar( str, key )
return str:gsub('%a', function(s)
local base = ascii_base(s)
return string.char(((s:byte() - base + key) % 26) + base)
end)
end
return cipher
Modules](https://crownmelresort.com/image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-34-2048.jpg)
![@etiene_dTopConf Tallinn 2015
-- Cipher module
--[[ Based on algorithms/caesar_cipher.lua
by Roland Yonaba ]]
local cipher = {}
local function ascii_base(s)
return s:lower() == s and ('a'):byte() or ('A'):byte()
end
function cipher.caesar( str, key )
return str:gsub('%a', function(s)
local base = ascii_base(s)
return string.char(((s:byte() - base + key) % 26) + base)
end)
end
return cipher
Modules](https://crownmelresort.com/image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-35-2048.jpg)
![@etiene_dTopConf Tallinn 2015
-- Cipher module
--[[ Based on algorithms/caesar_cipher.lua
by Roland Yonaba ]]
local cipher = {}
local function ascii_base(s)
return s:lower() == s and ('a'):byte() or ('A'):byte()
end
function cipher.caesar( str, key ) --cipher.caesar = function(str,key)
return str:gsub('%a', function(s)
local base = ascii_base(s)
return string.char(((s:byte() - base + key) % 26) + base)
end)
end
return cipher
Modules
public](https://crownmelresort.com/image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-36-2048.jpg)
![@etiene_dTopConf Tallinn 2015
-- Cipher module
--[[ Based on algorithms/caesar_cipher.lua
by Roland Yonaba ]]
local cipher = {}
local function ascii_base(s)
return s:lower() == s and ('a'):byte() or ('A'):byte()
end
function cipher.caesar( str, key )
return str:gsub('%a', function(s)
local base = ascii_base(s)
return string.char(((s:byte() - base + key) % 26) + base)
end)
end
return cipher
Modules
private](https://crownmelresort.com/image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-37-2048.jpg)
![@etiene_dTopConf Tallinn 2015
-- Cipher module
--[[ Based on algorithms/caesar_cipher.lua
by Roland Yonaba ]]
local cipher = {}
local function ascii_base(s)
return s:lower() == s and ('a'):byte() or ('A'):byte()
end
function cipher.caesar( str, key )
return str:gsub('%a', function(s)
local base = ascii_base(s)
return string.char(((s:byte() - base + key) % 26) + base)
end)
end
return cipher
Modules
local cipher = require “cipher”
print(cipher.caesar(“test”,3) -- whvw](https://crownmelresort.com/image.slidesharecdn.com/20151117topconf-151119122847-lva1-app6892/75/Get-started-with-Lua-programming-38-2048.jpg)
Uploaded byEtiene Dalcol
Get started with Lua programming
- The document provides an introduction to Lua programming including what Lua is, why use Lua, key concepts like tables, modules, metatables, and ways to get started with Lua programming through embedding, general purpose scripting, or common libraries and tools.
More Related Content
Similar to Get started with Lua programming
Get started with Lua programming
- 1. Get started with Luaprogramming Etiene Dalcol @etiene_d
- 2.
- 3. @etiene_dTopConf Tallinn 2015 Sailor! AnMVC web framework in Lua sailorproject.org
- 4. @etiene_dTopConf Tallinn 2015 LuaLadies A female Lua user group lualadies.org
- 5. @etiene_dTopConf Tallinn 2015 GoogleSummer of Code LabLua
- 6. @etiene_dTopConf Tallinn 2015 What’sLua Why Lua Key Concepts Going further
- 7.
- 8. @etiene_dTopConf Tallinn 2015 •Script Language • Duck-typed • Multi-paradigm • procedural, OO, functional • Garbage collection • Coroutines • First-class functions • Lexical scoping • Proper tail calls • MIT License What is Lua?
- 9. @etiene_dTopConf Tallinn 2015 WhyLua? Powerful.
- 10. @etiene_dTopConf Tallinn 2015 WhyLua? Size (docs included) First-class functions + Lexical scoping + Metatables Native C API 276 Kb Object Orientation Ada, Fortran, Java, Smalltalk, C#, Perl, Ruby etc. +
- 11.
- 12.
- 13.
- 14. TopConf Tallinn 2015@etiene_d "Since Lua itself is so simple, it tends to encourage you to solve problems simply." Ragnar Svensson - Lead Developer at King (Lua Workshop Oct 15 2015)
- 15.
- 16. @etiene_dTopConf Tallinn 2015 http://www.humbedooh.com/presentations/ACNA%20-%20mod_lua.odpIntroducing mod_lua by Daniel Gruno
- 17. @etiene_dTopConf Tallinn 2015 MyReasons • It looks cool (I heard you could make games with it) Better
- 18. @etiene_dTopConf Tallinn 2015 BetterReasons • It looks cool (I heard you could make games with it) • It’s made in my home country (In my university to be more precise)
- 19. @etiene_dTopConf Tallinn 2015 •It looks cool (I heard you could make games with it) • It’s made in my home country (In my university to be more precise) • It’s easy to learn Better Reasons
- 20. @etiene_dTopConf Tallinn 2015 •The index starts at 1 • There’s no continue • The non-equality operator is ~= • null is nil • Comments are - - • Only nil and false are equivalent to false • Functions can genuinely return multiple values • Variables are global by default • Pattern matching is not regular expression • The concatenation operator is .. What’s different
- 21.
- 22. @etiene_dTopConf Tallinn 2015 •The index starts at 1 • There’s no continue • The non-equality operator is ~= • null is nil • Comments are - - • Only nil and false are equivalent to false • Functions can genuinely return multiple values • Variables are global by default • Pattern matching is not regular expression • The concatenation operator is .. What’s different
- 23. @etiene_dTopConf Tallinn 2015 Quickidioms • a, b = b, a • There’s no ternary operator but you can return x==1 and “yes” or “no” • The access to local variables is faster than global local match = string.match
- 24. @etiene_dTopConf Tallinn 2015 UsingLua: three approaches Embedded Scripting General-purpose
- 25. @etiene_dTopConf Tallinn 2015 GettingLua • lua.org > download • OS package manager • apt-get install lua • brew install lua LuaRocks • luarocks.org > install • OS package manager • apt-get install luarocks
- 26.
- 27. @etiene_dTopConf Tallinn 2015 •The only way to structure data • Array, dictionary, object, list, queue, module… • Any value can be a key, except nil and nan • Behind the scenes: array or hash table • Passed as reference • The length operator: # • pairs(t) x ipairs(t) Tables
- 28. @etiene_dTopConf Tallinn 2015 Tables Header keyvalue “x” 9.2 nil value 100 200 300 nil
- 29. @etiene_dTopConf Tallinn 2015 •The only way to structure data • Array, dictionary, object, list, queue, module… • Any value can be a key, except nil • Behind the scenes: array or hash table • Passed as reference • The length operator: # • pairs(t) x ipairs(t) Tables
- 30. @etiene_dTopConf Tallinn 2015 Tables locala = { 1, 3, 5, 7, 9} local sum = 0 for i=1,#a do sum = sum + a[i] end print(sum) -- 25
- 31. @etiene_dTopConf Tallinn 2015 locala = { 1, 3, 5, 7, 9} local sum = 0 for i=1,#a do sum = sum + a[i] end print(sum) -- 25 Tables local a = {} a[1] = 1 a[2] = 3 -- etc local sum = 0 for _, x in ipairs(a) do sum = sum + x end print(sum)
- 32. @etiene_dTopConf Tallinn 2015 locala = { 1, 3, 5, 7, 9} local sum = 0 for i=1,#a do sum = sum + a[i] end print(sum) -- 25 local a, x = 10, “y” local point = { x = a, y = 25} print(point[“x”], point[“y”]) -- 10 25 print(point[x], point[y]) -- 25 nil print(point.x, point.y) -- 10 25 Tables
- 33. @etiene_dTopConf Tallinn 2015 locala = { 1, 3, 5, 7, 9} local sum = 0 for i=1,#a do sum = sum + a[i] end print(sum) -- 25 local a, x = 10, “y” local point = { x = a, y = 25} print(point[“x”], point[“y”]) -- 10 25 print(point[x], point[y]) -- 25 nil print(point.x, point.y) -- 10 25 -- sets and multisets local ips = { “5.101.112.0” = true, “213.35.128.0” = true } local connections = { “5.101.112.0” = 5, “213.35.128.0” = 2 } Tables
- 34. @etiene_dTopConf Tallinn 2015 --Cipher module --[[ Based on algorithms/caesar_cipher.lua by Roland Yonaba ]] local cipher = {} local function ascii_base(s) return s:lower() == s and ('a'):byte() or ('A'):byte() end function cipher.caesar( str, key ) return str:gsub('%a', function(s) local base = ascii_base(s) return string.char(((s:byte() - base + key) % 26) + base) end) end return cipher Modules
- 35. @etiene_dTopConf Tallinn 2015 --Cipher module --[[ Based on algorithms/caesar_cipher.lua by Roland Yonaba ]] local cipher = {} local function ascii_base(s) return s:lower() == s and ('a'):byte() or ('A'):byte() end function cipher.caesar( str, key ) return str:gsub('%a', function(s) local base = ascii_base(s) return string.char(((s:byte() - base + key) % 26) + base) end) end return cipher Modules
- 36. @etiene_dTopConf Tallinn 2015 --Cipher module --[[ Based on algorithms/caesar_cipher.lua by Roland Yonaba ]] local cipher = {} local function ascii_base(s) return s:lower() == s and ('a'):byte() or ('A'):byte() end function cipher.caesar( str, key ) --cipher.caesar = function(str,key) return str:gsub('%a', function(s) local base = ascii_base(s) return string.char(((s:byte() - base + key) % 26) + base) end) end return cipher Modules public
- 37. @etiene_dTopConf Tallinn 2015 --Cipher module --[[ Based on algorithms/caesar_cipher.lua by Roland Yonaba ]] local cipher = {} local function ascii_base(s) return s:lower() == s and ('a'):byte() or ('A'):byte() end function cipher.caesar( str, key ) return str:gsub('%a', function(s) local base = ascii_base(s) return string.char(((s:byte() - base + key) % 26) + base) end) end return cipher Modules private
- 38. @etiene_dTopConf Tallinn 2015 --Cipher module --[[ Based on algorithms/caesar_cipher.lua by Roland Yonaba ]] local cipher = {} local function ascii_base(s) return s:lower() == s and ('a'):byte() or ('A'):byte() end function cipher.caesar( str, key ) return str:gsub('%a', function(s) local base = ascii_base(s) return string.char(((s:byte() - base + key) % 26) + base) end) end return cipher Modules local cipher = require “cipher” print(cipher.caesar(“test”,3) -- whvw
- 39. @etiene_dTopConf Tallinn 2015 •Overload operators • Override built-in functions such as tostring • Treat missing fields or intercept new field creation • Call table as a function • Metamethods: __add, __sub, __mul, __div, __mod, __pow, __unm, __concat, __len, __eq, __lt, __le, __index, __newindex, __call, __tostring, __ipairs, __pairs, __gc Metatables
- 40. @etiene_dTopConf Tallinn 2015 localmt = {} local function new(r, i) return setmetatable({ real = r or 0, im = i or 0}, mt) end local function is_complex(v) return getmetatable(v) == mt end local function add(c1, c2) if not is_complex(c1) then return new(c2.real + c1, c2.im) elseif not is_complex(c2) then return new(c1.real + c2, c1.im) end return new(c1.real + c2.real, c1.im + c2.im) end local function tos(c) return tostring(c.real) .. "+".. tostring(c.im) .. "i" end mt.__add = add mt.__tostring = tos Complex numbers
- 41. @etiene_dTopConf Tallinn 2015 localmt = {} local function new(r, i) return setmetatable({ real = r or 0, im = i or 0}, mt) end local function is_complex(v) return getmetatable(v) == mt end local function add(c1, c2) if not is_complex(c1) then return new(c2.real + c1, c2.im) elseif not is_complex(c2) then return new(c1.real + c2, c1.im) end return new(c1.real + c2.real, c1.im + c2.im) end local function tos(c) return tostring(c.real) .. "+".. tostring(c.im) .. "i" end mt.__add = add mt.__tostring = tos Complex numbers
- 42. @etiene_dTopConf Tallinn 2015 localmt = {} local function new(r, i) return setmetatable({ real = r or 0, im = i or 0}, mt) end local function is_complex(v) return getmetatable(v) == mt end local function add(c1, c2) if not is_complex(c1) then return new(c2.real + c1, c2.im) elseif not is_complex(c2) then return new(c1.real + c2, c1.im) end return new(c1.real + c2.real, c1.im + c2.im) end local function tos(c) return tostring(c.real) .. "+".. tostring(c.im) .. "i" end mt.__add = add mt.__tostring = tos Complex numbers
- 43. @etiene_dTopConf Tallinn 2015 localmt = {} local function new(r, i) return setmetatable({ real = r or 0, im = i or 0}, mt) end local function is_complex(v) return getmetatable(v) == mt end local function add(c1, c2) if not is_complex(c1) then return new(c2.real + c1, c2.im) elseif not is_complex(c2) then return new(c1.real + c2, c1.im) end return new(c1.real + c2.real, c1.im + c2.im) end local function tos(c) return tostring(c.real) .. "+".. tostring(c.im) .. "i" end mt.__add = add mt.__tostring = tos Complex numbers
- 44. @etiene_dTopConf Tallinn 2015 localmt = {} local function new(r, i) return setmetatable({ real = r or 0, im = i or 0}, mt) end local function is_complex(v) return getmetatable(v) == mt end local function add(c1, c2) if not is_complex(c1) then return new(c2.real + c1, c2.im) elseif not is_complex(c2) then return new(c1.real + c2, c1.im) end return new(c1.real + c2.real, c1.im + c2.im) end local function tos(c) return tostring(c.real) .. "+".. tostring(c.im) .. "i" end mt.__add = add mt.__tostring = tos Complex numbers
- 45. @etiene_dTopConf Tallinn 2015 localmt = {} local function new(r, i) return setmetatable({ real = r or 0, im = i or 0}, mt) end local function is_complex(v) return getmetatable(v) == mt end local function add(c1, c2) if not is_complex(c1) then return new(c2.real + c1, c2.im) elseif not is_complex(c2) then return new(c1.real + c2, c1.im) end return new(c1.real + c2.real, c1.im + c2.im) end local function tos(c) return tostring(c.real) .. "+".. tostring(c.im) .. "i" end mt.__add = add mt.__tostring = tos >local c1 = new(2,3) >print( c1 + 5 ) 7+3i Complex numbers
- 46. @etiene_dTopConf Tallinn 2015 localsquare = { x = 10, y = 20, side = 25 } function square.move(obj, dx, dy) obj.x = obj.x + dx obj.y = obj.y + dy end function square:area() return self.side ^ 2 end print(square:area()) -- 625 Objects
- 47. @etiene_dTopConf Tallinn 2015 localsquare = { x = 10, y = 20, side = 25 } function square.move(obj, dx, dy) obj.x = obj.x + dx obj.y = obj.y + dy end function square:area() return self.side ^ 2 end print(square:area()) -- 625 Objects
- 48. @etiene_dTopConf Tallinn 2015 localsquare = { x = 10, y = 20, side = 25 } function square.move(obj, dx, dy) obj.x = obj.x + dx obj.y = obj.y + dy end function square:area() return self.side ^ 2 end print(square:area()) -- 625 Objects
- 49. @etiene_dTopConf Tallinn 2015 localsquare = { x = 10, y = 20, side = 25 } function square.move(obj, dx, dy) obj.x = obj.x + dx obj.y = obj.y + dy end function square:area() return self.side ^ 2 end print(square:area()) -- 625 Objects
- 50. @etiene_dTopConf Tallinn 2015 localsquare = { x = 10, y = 20, side = 25 } function square.move(obj, dx, dy) obj.x = obj.x + dx obj.y = obj.y + dy end function square:area() return self.side ^ 2 end print(square:area()) -- 625 local square2 = (x = 30, y = 5, side = 10} print(square.area(square2)) -- 100 Objects
- 51. @etiene_dTopConf Tallinn 2015 localsquare = { x = 10, y = 20, side = 25 } function square.move(obj, dx, dy) obj.x = obj.x + dx obj.y = obj.y + dy end function square:area() return self.side ^ 2 end print(square:area()) -- 625 local square2 = (x = 30, y = 5, side = 10} print(square.area(square2)) -- 100 Objects
- 52. @etiene_dTopConf Tallinn 2015 localSquare = {} function Square:new(x, y, side) local o = { x = x, y = y, side = side} setmetatable(o, self) self.__index = self return o end function Square:move(dx, dy) self.x = self.x + dx self.y = self.y + dy end function Square:area() return self.side ^ 2 end return Square Object Orientation
- 53. @etiene_dTopConf Tallinn 2015 localSquare = {} function Square:new(x, y, side) local o = { x = x, y = y, side = side} setmetatable(o, self) self.__index = self return o end function Square:move(dx, dy) self.x = self.x + dx self.y = self.y + dy end function Square:area() return self.side ^ 2 end return Square Object Orientation
- 54. @etiene_dTopConf Tallinn 2015 localSquare = {} function Square:new(x, y, side) local o = { x = x, y = y, side = side} setmetatable(o, self) self.__index = self return o end function Square:move(dx, dy) self.x = self.x + dx self.y = self.y + dy end function Square:area() return self.side ^ 2 end return Square Object Orientation
- 55. @etiene_dTopConf Tallinn 2015 localSquare = {} function Square:new(x, y, side) local o = { x = x, y = y, side = side} setmetatable(o, self) self.__index = self return o end function Square:move(dx, dy) self.x = self.x + dx self.y = self.y + dy end function Square:area() return self.side ^ 2 end return Square Object Orientation
- 56. @etiene_dTopConf Tallinn 2015 localSquare = {} function Square:new(x, y, side) local o = { x = x, y = y, side = side} setmetatable(o, self) self.__index = self return o end function Square:move(dx, dy) self.x = self.x + dx self.y = self.y + dy end function Square:area() return self.side ^ 2 end return Square local Square = require “square” local s1 = Square:new(10,20,25) local s2 = Square:new(30,5,10) print(s1:area()) -- 625 print(s2:area()) -- 100 Object Orientation
- 57.
- 58. @etiene_dTopConf Tallinn 2015 •Books • Programming in Lua: http://www.lua.org/pil/ • Lua Programming Gems: http://www.lua.org/gems/ • Tutorials • Lua Style Guide: http://lua-users.org/wiki/LuaStyleGuide • Lua Missions: https://github.com/kikito/lua_missions • Misc • CodeCombat: https://codecombat.com • Community • Lua mail list: http://www.lua.org/lua-l.html Resources
- 59. @etiene_dTopConf Tallinn 2015 •Hardware • eLua: http://www.eluaproject.net/ • nodemcu: http://nodemcu.com • Math and scientific computing • SciLua http://www.scilua.org/ • Torch: http://torch.ch • GSL Shell: http://www.nongnu.org/gsl-shell/ Cool tools in Lua
- 60. @etiene_dTopConf Tallinn 2015 •Game development • Love2D: https://love2d.org/ • Defold: http://www.defold.com/ • Cocos2d: http://www.cocos2d-x.org/ • Corona: https://coronalabs.com • Web development • OpenResty http://openresty.org • Lapis: http://leafo.net/lapis/ • Luvit: https://luvit.io/ • Sailor: http://sailorproject.org/ • Moonshine: http://moonshinejs.org/ Cool tools in Lua
- 61. @etiene_dTopConf Tallinn 2015 •IDE • ZeroBrane Studio: http://studio.zerobrane.com/ • Testing • Busted: http://olivinelabs.com/busted/ • Package management • LuaRocks http://luarocks.org • Misc • Moonscript: http://moonscript.org/ • Awesome Lua: https://github.com/LewisJEllis/awesome-lua Cool tools in Lua
- 62.