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State & Monsters
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if( !!!( user == undefined ) ){
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1 var months = {
2 '2012': [ 'jan', 'feb', 'mar', 'apr',
3 'may', 'jun', 'jul', 'aug',
4 'sep', 'oct', 'nov', 'dec' ],
5
6 '2011': [ 'jan', 'feb', 'mar', 'apr',
7 'may', 'jun', 'jul', 'aug',
8 'sep', 'oct', 'nov', 'dec' ],
9
10 '2010': [ 'jan', 'feb', 'mar', 'apr',
11 'may', 'jun', 'jul', 'aug',
12 'sep', 'oct', 'nov', 'dec' ],
13
14 '2009': [ 'jan', 'feb', 'mar', 'apr',
15 'may', 'jun', 'jul', 'aug',
16 'sep', 'oct', 'nov', 'dec' ]
17
18 // (...)
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No content
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what’s big ball of mud?
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No content
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1 $(document).ready( function(){
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1 $(document).ready( function(){
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3 var board = [ ['_','_','_'],
4 ['_','_','_'],
5 ['_','_','_'] ];
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19 });
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1 $(document).ready( function(){
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3 var board = [ ['_','_','_'],
4 ['_','_','_'],
5 ['_','_','_'] ];
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7 var placeMark = function(x,y,mark){
8 board[x][y] = mark;
9 }
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19 });
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1 $(document).ready( function(){
2
3 var board = [ ['_','_','_'],
4 ['_','_','_'],
5 ['_','_','_'] ];
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7 var placeMark = function(x,y,mark){
8 board[x][y] = mark;
9 }
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13 $('.board-element').click(function(){
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18 });
19 });
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1 $(document).ready( function(){
2
3 var board = [ ['_','_','_'],
4 ['_','_','_'],
5 ['_','_','_'] ];
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7 var placeMark = function(x,y,mark){
8 board[x][y] = mark;
9 }
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13 $('.board-element').click(function(){
14 var x = $(this).attr('data-x');
15 var y = $(this).attr('data-y');
16
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18 });
19 });
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1 $(document).ready( function(){
2
3 var board = [ ['_','_','_'],
4 ['_','_','_'],
5 ['_','_','_'] ];
6
7 var placeMark = function(x,y,mark){
8 board[x][y] = mark;
9 }
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11
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13 $('.board-element').click(function(){
14 var x = $(this).attr('data-x');
15 var y = $(this).attr('data-y');
16 placeMark(x,y,
17
18 });
19 });
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1 $(document).ready( function(){
2
3 var board = [ ['_','_','_'],
4 ['_','_','_'],
5 ['_','_','_'] ];
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7 var placeMark = function(x,y,mark){
8 board[x][y] = mark;
9 }
10
11 var currentMark = 'X';
12
13 $('.board-element').click(function(){
14 var x = $(this).attr('data-x');
15 var y = $(this).attr('data-y');
16 placeMark(x,y,
17
18 });
19 });
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1 $(document).ready( function(){
2
3 var board = [ ['_','_','_'],
4 ['_','_','_'],
5 ['_','_','_'] ];
6
7 var placeMark = function(x,y,mark){
8 board[x][y] = mark;
9 }
10
11 var currentMark = 'X';
12
13 $('.board-element').click(function(){
14 var x = $(this).attr('data-x');
15 var y = $(this).attr('data-y');
16 placeMark(x,y,currentMark);
17
18 });
19 });
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1 $(document).ready( function(){
2
3 var board = [ ['_','_','_'],
4 ['_','_','_'],
5 ['_','_','_'] ];
6
7 var placeMark = function(x,y,mark){
8 board[x][y] = mark;
9 }
10
11 var currentMark = 'X';
12
13 $('.board-element').click(function(){
14 var x = $(this).attr('data-x');
15 var y = $(this).attr('data-y');
16 placeMark(x,y,currentMark);
17 swapCurrentMark();
18 });
19 });
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getting muddy.
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1 var currentMark = 'X';
2
3 $('.board-element').click(function(){
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5 var x = $(this).attr('data-x');
6 var y = $(this).attr('data-y');
7 placeMark(x,y,currentMark);
8 swapCurrentMark();
9
10 });
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1 var currentMark = 'X';
2
3 $('.board-element').click(function(){
4
5 var x = $(this).attr('data-x');
6 var y = $(this).attr('data-y');
7 placeMark(x,y,currentMark);
8 swapCurrentMark();
9
10 });
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12
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14 $('#resign').click(function(){
15
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20 });
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1 var currentMark = 'X';
2
3 $('.board-element').click(function(){
4
5 var x = $(this).attr('data-x');
6 var y = $(this).attr('data-y');
7 placeMark(x,y,currentMark);
8 swapCurrentMark();
9
10 });
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12
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14 $('#resign').click(function(){
15 if (currentMark = 'X'){
16 winner = 'O';
17
18
19
20 });
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1 var currentMark = 'X';
2
3 $('.board-element').click(function(){
4
5 var x = $(this).attr('data-x');
6 var y = $(this).attr('data-y');
7 placeMark(x,y,currentMark);
8 swapCurrentMark();
9
10 });
11
12 var winner = null;
13
14 $('#resign').click(function(){
15 if (currentMark = 'X'){
16 winner = 'O';
17
18
19
20 });
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1 var currentMark = 'X';
2
3 $('.board-element').click(function(){
4
5 var x = $(this).attr('data-x');
6 var y = $(this).attr('data-y');
7 placeMark(x,y,currentMark);
8 swapCurrentMark();
9
10 });
11
12 var winner = null;
13
14 $('#resign').click(function(){
15 if (currentMark = 'X'){
16 winner = 'O';
17 } else {
18 winner = 'X';
19 }
20 });
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1 var currentMark = 'X';
2
3 $('.board-element').click(function(){
4 if (!winner){
5 var x = $(this).attr('data-x');
6 var y = $(this).attr('data-y');
7 placeMark(x,y,currentMark);
8 swapCurrentMark();
9 }
10 });
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12 var winner = null;
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14 $('#resign').click(function(){
15 if (currentMark = 'X'){
16 winner = 'O';
17 } else {
18 winner = 'X';
19 }
20 });
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1 var currentMark = 'X';
2
3 $('.board-element').click(function(){
4 if (!winner){
5 var x = $(this).attr('data-x');
6 var y = $(this).attr('data-y');
7 placeMark(x,y,currentMark);
8 swapCurrentMark();
9 }
10 });
11
12 var winner = null;
13
14 $('#resign').click(function(){
15 if (currentMark = 'X'){
16 winner = 'O';
17 } else {
18 winner = 'X';
19 }
20 });
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1 var currentMark = 'X';
2
3 $('.board-element').click(function(){
4 if (!winner){
5 var x = $(this).attr('data-x');
6 var y = $(this).attr('data-y');
7 placeMark(x,y,currentMark);
8 swapCurrentMark();
9 }
10 });
11
12 var winner = null;
13
14 $('#resign').click(function(){
15 if (currentMark = 'X'){
16 winner = 'O';
17 } else {
18 winner = 'X';
19 }
20 });
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1 var currentMark = 'X';
2
3 $('.board-element').click(function(){
4 if (!winner){
5 var x = $(this).attr('data-x');
6 var y = $(this).attr('data-y');
7 placeMark(x,y,currentMark);
8 swapCurrentMark();
9 }
10 });
11
12 var winner = null;
13
14 $('#resign').click(function(){
15 if (currentMark = 'X'){
16 winner = 'O';
17 } else {
18 winner = 'X';
19 }
20 });
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1 var currentMark = 'X';
2
3 $('.board-element').click(function(){
4 if (!winner){
5 var x = $(this).attr('data-x');
6 var y = $(this).attr('data-y');
7 placeMark(x,y,currentMark);
8 swapCurrentMark();
9 }
10 });
11
12 var winner = null;
13
14 $('#resign').click(function(){
15 if (currentMark = 'X'){
16 winner = 'O';
17 } else {
18 winner = 'X';
19 }
20 });
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1 var currentMark = 'X';
2
3 $('.board-element').click(function(){
4 if (!winner){
5 var x = $(this).attr('data-x');
6 var y = $(this).attr('data-y');
7 placeMark(x,y,currentMark);
8 swapCurrentMark();
9 }
10 });
11
12 var winner = null;
13
14 $('#resign').click(function(){
15 if (currentMark = 'X'){
16 winner = 'O';
17 } else {
18 winner = 'X';
19 }
20 });
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1 var currentMark = 'X';
2
3 $('.board-element').click(function(){
4 if (!winner){
5 var x = $(this).attr('data-x');
6 var y = $(this).attr('data-y');
7 placeMark(x,y,currentMark);
8 swapCurrentMark();
9 }
10 });
11
12 var winner = null;
13
14 $('#resign').click(function(){
15 if (currentMark = 'X'){
16 winner = 'O';
17 } else {
18 winner = 'X';
19 }
20 });
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No content
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tight coupling
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no architecture
tight coupling
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no architecture
tight coupling
poor state management
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working with mud.
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“A large fraction of the flaws in
software development are due to
programmers not fully understanding
all the possible states their code may
execute in.”
John Carmack, “Functional programming in C++”, 2012
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1 var board = [ ['_','_','_'],
2 ['_','_','_'],
3 ['_','_','_'] ];
4
5 var currentMark = 'X';
6
7 var winner = null;
8
9 var turn = 0;
10
11 //...
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1 var board = [ ['_','_','_'],
2 ['_','_','_'],
3 ['_','_','_'] ];
4
5 var currentMark = 'X';
6
7 var winner = null;
8
9 var turn = 0;
10
11 //...
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1 var board = [ ['_','_','_'],
2 ['_','_','_'],
3 ['_','_','_'] ];
4
5 var currentMark = 'X';
6
7 var winner = null;
8
9 var turn = 0;
10
11 //...
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1 var board = [ ['_','_','_'],
2 ['_','_','_'],
3 ['_','_','_'] ];
4
5 var currentMark = 'X';
6
7 var winner = null;
8
9 var turn = 0;
10
11 //...
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imperative | declarative
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Haskell
declarative; immutable.
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No content
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4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
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4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
7
8 replace index element list =
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4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
7
8 replace index element list =
9 (take index list) ++ [element] ++ (drop (index+1) list)
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4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
7
8 replace index element list =
9 (take index list) ++ [element] ++ (drop (index+1) list)
10
11 replace' x y element matrix =
12 replace x (replace y element (matrix !! x)) matrix
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4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
7
8 replace index element list =
9 (take index list) ++ [element] ++ (drop (index+1) list)
10
11 replace' x y element matrix =
12 replace x (replace y element (matrix !! x)) matrix
13
14 data Mark = O | X deriving (Eq)
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4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
7
8 replace index element list =
9 (take index list) ++ [element] ++ (drop (index+1) list)
10
11 replace' x y element matrix =
12 replace x (replace y element (matrix !! x)) matrix
13
14 data Mark = O | X deriving (Eq)
15
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22 winner board
23
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25
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4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
7
8 replace index element list =
9 (take index list) ++ [element] ++ (drop (index+1) list)
10
11 replace' x y element matrix =
12 replace x (replace y element (matrix !! x)) matrix
13
14 data Mark = O | X deriving (Eq)
15
16
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21
22 winner board
23 | any (== [Just O, Just O, Just O]) (patterns board) = Just O
24
25
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4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
7
8 replace index element list =
9 (take index list) ++ [element] ++ (drop (index+1) list)
10
11 replace' x y element matrix =
12 replace x (replace y element (matrix !! x)) matrix
13
14 data Mark = O | X deriving (Eq)
15
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22 winner board
23 | any (== [Just O, Just O, Just O]) (patterns board) = Just O
24 | any (== [Just X, Just X, Just X]) (patterns board) = Just X
25 | otherwise = Nothing
Slide 50
Slide 50 text
4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
7
8 replace index element list =
9 (take index list) ++ [element] ++ (drop (index+1) list)
10
11 replace' x y element matrix =
12 replace x (replace y element (matrix !! x)) matrix
13
14 data Mark = O | X deriving (Eq)
15
16
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19
20 patterns board = board ++ (transpose board) ++ (diagonals board)
21
22 winner board
23 | any (== [Just O, Just O, Just O]) (patterns board) = Just O
24 | any (== [Just X, Just X, Just X]) (patterns board) = Just X
25 | otherwise = Nothing
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4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
7
8 replace index element list =
9 (take index list) ++ [element] ++ (drop (index+1) list)
10
11 replace' x y element matrix =
12 replace x (replace y element (matrix !! x)) matrix
13
14 data Mark = O | X deriving (Eq)
15
16 diagonals [[a,_,b],
17 [_,c,_],
18 [d,_,e]] = [[a,c,e],[b,c,d]]
19
20 patterns board = board ++ (transpose board) ++ (diagonals board)
21
22 winner board
23 | any (== [Just O, Just O, Just O]) (patterns board) = Just O
24 | any (== [Just X, Just X, Just X]) (patterns board) = Just X
25 | otherwise = Nothing
Slide 52
Slide 52 text
4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
7
8 replace index element list =
9 (take index list) ++ [element] ++ (drop (index+1) list)
10
11 replace' x y element matrix =
12 replace x (replace y element (matrix !! x)) matrix
13
14 data Mark = O | X deriving (Eq)
15
16 diagonals [[a,_,b],
17 [_,c,_],
18 [d,_,e]] = [[a,c,e],[b,c,d]]
19
20 patterns board = board ++ (transpose board) ++ (diagonals board)
21
22 winner board
23 | any (== [Just O, Just O, Just O]) (patterns board) = Just O
24 | any (== [Just X, Just X, Just X]) (patterns board) = Just X
25 | otherwise = Nothing
Slide 53
Slide 53 text
4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
7
8 replace index element list =
9 (take index list) ++ [element] ++ (drop (index+1) list)
10
11 replace' x y element matrix =
12 replace x (replace y element (matrix !! x)) matrix
13
14 data Mark = O | X deriving (Eq)
15
16 diagonals [[a,_,b],
17 [_,c,_],
18 [d,_,e]] = [[a,c,e],[b,c,d]]
19
20 patterns board = board ++ (transpose board) ++ (diagonals board)
21
22 winner board
23 | any (== [Just O, Just O, Just O]) (patterns board) = Just O
24 | any (== [Just X, Just X, Just X]) (patterns board) = Just X
25 | otherwise = Nothing
Slide 54
Slide 54 text
4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
7
8 replace index element list =
9 (take index list) ++ [element] ++ (drop (index+1) list)
10
11 replace' x y element matrix =
12 replace x (replace y element (matrix !! x)) matrix
13
14 data Mark = O | X deriving (Eq)
15
16 diagonals [[a,_,b],
17 [_,c,_],
18 [d,_,e]] = [[a,c,e],[b,c,d]]
19
20 patterns board = board ++ (transpose board) ++ (diagonals board)
21
22 winner board
23 | any (== [Just O, Just O, Just O]) (patterns board) = Just O
24 | any (== [Just X, Just X, Just X]) (patterns board) = Just X
25 | otherwise = Nothing
Slide 55
Slide 55 text
4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
7
8 replace index element list =
9 (take index list) ++ [element] ++ (drop (index+1) list)
10
11 replace' x y element matrix =
12 replace x (replace y element (matrix !! x)) matrix
13
14 data Mark = O | X deriving (Eq)
15
16 diagonals [[a,_,b],
17 [_,c,_],
18 [d,_,e]] = [[a,c,e],[b,c,d]]
19
20 patterns board = board ++ (transpose board) ++ (diagonals board)
21
22 winner board
23 | any (== [Just O, Just O, Just O]) (patterns board) = Just O
24 | any (== [Just X, Just X, Just X]) (patterns board) = Just X
25 | otherwise = Nothing
Slide 56
Slide 56 text
4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
7
8 replace index element list =
9 (take index list) ++ [element] ++ (drop (index+1) list)
10
11 replace' x y element matrix =
12 replace x (replace y element (matrix !! x)) matrix
13
14 data Mark = O | X deriving (Eq)
15
16 diagonals [[a,_,b],
17 [_,c,_],
18 [d,_,e]] = [[a,c,e],[b,c,d]]
19
20 patterns board = board ++ (transpose board) ++ (diagonals board)
21
22 winner board
23 | any (== [Just O, Just O, Just O]) (patterns board) = Just O
24 | any (== [Just X, Just X, Just X]) (patterns board) = Just X
25 | otherwise = Nothing
Slide 57
Slide 57 text
4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
7
8 replace index element list =
9 (take index list) ++ [element] ++ (drop (index+1) list)
10
11 replace' x y element matrix =
12 replace x (replace y element (matrix !! x)) matrix
13
14 data Mark = O | X deriving (Eq)
15
16 diagonals [[a,_,b],
17 [_,c,_],
18 [d,_,e]] = [[a,c,e],[b,c,d]]
19
20 patterns board = board ++ (transpose board) ++ (diagonals board)
21
22 winner board
23 | any (== [Just O, Just O, Just O]) (patterns board) = Just O
24 | any (== [Just X, Just X, Just X]) (patterns board) = Just X
25 | otherwise = Nothing
Slide 58
Slide 58 text
4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
7
8 replace index element list =
9 (take index list) ++ [element] ++ (drop (index+1) list)
10
11 replace' x y element matrix =
12 replace x (replace y element (matrix !! x)) matrix
13
14 data Mark = O | X deriving (Eq)
15
16 diagonals [[a,_,b],
17 [_,c,_],
18 [d,_,e]] = [[a,c,e],[b,c,d]]
19
20 patterns board = board ++ (transpose board) ++ (diagonals board)
21
22 winner board
23 | any (== [Just O, Just O, Just O]) (patterns board) = Just O
24 | any (== [Just X, Just X, Just X]) (patterns board) = Just X
25 | otherwise = Nothing
Slide 59
Slide 59 text
4 board = [[Nothing, Nothing, Nothing],
5 [Nothing, Nothing, Nothing],
6 [Nothing, Nothing, Nothing]]
7
8 replace index element list =
9 (take index list) ++ [element] ++ (drop (index+1) list)
10
11 replace' x y element matrix =
12 replace x (replace y element (matrix !! x)) matrix
13
14 data Mark = O | X deriving (Eq)
15
16 diagonals [[a,_,b],
17 [_,c,_],
18 [d,_,e]] = [[a,c,e],[b,c,d]]
19
20 patterns board = board ++ (transpose board) ++ (diagonals board)
21
22 winner board
23 | any (== [Just O, Just O, Just O]) (patterns board) = Just O
24 | any (== [Just X, Just X, Just X]) (patterns board) = Just X
25 | otherwise = Nothing
Slide 60
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GitHub:
nbartlomiej/takefive
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in practice?
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no state: the good parts
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•Easier to test
no state: the good parts
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•Easier to test
•Asynchronousabilityness
no state: the good parts
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•Easier to test
•Asynchronousabilityness
•Easy to maintain
no state: the good parts
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1
2 // var winner = null;
3
4
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12
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1
2 // var winner = null;
3
4 Board.prototype.winner = function(){
5 if ( this.winnerX() ) {
6 return 'X';
7 } else if ( this.winnerO() } {
8 return 'O';
9 } else {
10 return null;
11 }
12 }
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1 // var currentMark = 'X';
2
3
4
5
6
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1 // var currentMark = 'X';
2
3 Board.prototype.place = function(x,y,mark){
4 this.board[x][y] = mark;
5 }
6
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1 // $('.board-element').click(function(){
2 // if (!winner){
3 // var x = $(this).attr('data-x');
4 // var y = $(this).attr('data-y');
5 // placeMark(x,y,currentMark);
6 // swapCurrentMark();
7 // }
8 // });
9
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Slide 71 text
1 // $('.board-element').click(function(){
2 // if (!winner){
3 // var x = $(this).attr('data-x');
4 // var y = $(this).attr('data-y');
5 // placeMark(x,y,currentMark);
6 // swapCurrentMark();
7 // }
8 // });
9
10 $('*[data-board-element]').click(function(){
11 board.moveIntent(
12 $(this).attr('data-x'),
13 $(this).attr('data-y')
14 );
15 }
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1 // $('.board-element').click(function(){
2 // if (!winner){
3 // var x = $(this).attr('data-x');
4 // var y = $(this).attr('data-y');
5 // placeMark(x,y,currentMark);
6 // swapCurrentMark();
7 // }
8 // });
9
10 $('*[data-board-element]').click(function(){
11 board.moveIntent(
12 $(this).attr('data-x'),
13 $(this).attr('data-y')
14 );
15 }
16
17 $('*[data-board-element]').click(function(){
18 new BoardInput(this);
19 }
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summary
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@nbartlomiej
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