Use ReasonML in your React applications (RuhrJS 2018)

Transcript

1. ÷÷÷÷÷÷≥≥≥ Use ReasonML in your React applications David Kopal
2. @coding_lawyer @coding_lawyer codinglawyer.io meetup organizer contributor I’m David Kopal
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4. @coding_lawyer Who heard about ason?
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6. @coding_lawyer Who wants to write better React?
7. @coding_lawyer React isn’t a native JavaScript library
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9. @coding_lawyer Immutability
10. @coding_lawyer Immutability
11. @coding_lawyer Immutability
12. @coding_lawyer Immutability Functional programming
13. @coding_lawyer Immutability Functional programming
14. @coding_lawyer Immutability Functional programming
15. @coding_lawyer Immutability Type system Functional programming
16. @coding_lawyer Immutability Type system Functional programming
17. @coding_lawyer Immutability Type system Functional programming
18. @coding_lawyer Immutability Type system Functional programming
19. @coding_lawyer Immutability Type system Functional programming
20. @coding_lawyer Immutability Type system Functional programming
21. @coding_lawyer Immutability Type system Functional programming
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23. @coding_lawyer semantics familiar syntax
24. @coding_lawyer let fizzbuzz = (i) => switch (i mod 3, i mod 5) { | (0, 0) => "FizzBuzz" | (0, _) => "Fizz" | (_, 0) => "Buzz" | _ => string_of_int(i) }; for (i in 1 to 100) { Js.log(fizzbuzz(i)) };
25. @coding_lawyer compiler
26. @coding_lawyer function fizzbuzz(i) { var match = i % 3 var match$1 = i % 5 if (match !== 0) { if (match$1 !== 0) { return String(i) } else { return 'Buzz' } } else if (match$1 !== 0) { return 'Fizz' } else { return 'FizzBuzz' } } for (var i = 1; i <= 100; ++i) { console.log(fizzbuzz(i)) } let fizzbuzz = (i) => switch (i mod 3, i mod 5) { | (0, 0) => "FizzBuzz" | (0, _) => "Fizz" | (_, 0) => "Buzz" | _ => string_of_int(i) }; for (i in 1 to 100) { Js.log(fizzbuzz(i)) };
27. @coding_lawyer JavaScript interop
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29. @coding_lawyer Reason is compatible with React
30. @coding_lawyer Reason is compatible with React React was developed for Reason
31. @coding_lawyer adjusted JavaScript to React’s needs
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40. @coding_lawyer semantics familiar syntax
41. @coding_lawyer safer React
42. @coding_lawyer “[Reason] is the best way to take React to the next level” Jordan Walke, creator of Reason, React
43. @coding_lawyer Tic Tac Toe github.com/codinglawyer/reason-tic-tac-toe
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48. @coding_lawyer Game Board App BoardRow Square
49. @coding_lawyer Game Board App BoardRow Square
50. @coding_lawyer Game Board App BoardRow Square
51. @coding_lawyer Game Board App BoardRow Square
52. @coding_lawyer Game Board App BoardRow Square
53. @coding_lawyer Game Board App BoardRow Square
54. @coding_lawyer components
55. @coding_lawyer stateless component
56. @coding_lawyer Game Board App BoardRow Square
57. @coding_lawyer let component = ReasonReact.statelessComponent("App"); let make = _children => { ...component, render: _self => <div> <div className=“title"> (ReasonReact.string("Tic Tac Toe")) </div> <Game /> </div>, };
58. @coding_lawyer let component = ReasonReact.statelessComponent("App"); let make = _children => { ...component, render: _self => <div> <div className="title"> (ReasonReact.string("Tic Tac Toe")) </div> <Game /> </div>, };
59. @coding_lawyer let component = ReasonReact.statelessComponent("App"); let make = _children => { ...component, render: _self => <div> <div className="title"> (ReasonReact.string("Tic Tac Toe")) </div> <Game /> </div>, };
60. @coding_lawyer let component = ReasonReact.statelessComponent("App"); let make = _children => { ...component, render: _self => <div> <div className="title"> (ReasonReact.string("Tic Tac Toe")) </div> <Game /> </div>, };
61. @coding_lawyer let component = ReasonReact.statelessComponent("App"); let make = _children => { ...component, render: _self => <div> <div className=“title"> (ReasonReact.string("Tic Tac Toe")) </div> <Game /> </div>, };
62. @coding_lawyer reducer component
63. @coding_lawyer Game Board App BoardRow Square
64. @coding_lawyer let component = ReasonReact.reducerComponent("Game"); let make = _children => { ...component, initialState: () => { board: […], gameState:… }, reducer: (action: action, state: state) => switch (action) { | Restart => … | ClickSquare((id: string)) => … }, render: ({state, send}) => <div className="game"> <Board state onRestart=(_evt => send(Restart)) onMark=(id => send(ClickSquare(id))) /> </div>, };
65. @coding_lawyer let component = ReasonReact.reducerComponent("Game"); let make = _children => { ...component, initialState: () => { board: […], gameState:… }, reducer: (action: action, state: state) => switch (action) { | Restart => … | ClickSquare((id: string)) => … }, render: ({state, send}) => <div className="game"> <Board state onRestart=(_evt => send(Restart)) onMark=(id => send(ClickSquare(id))) /> </div>, };
66. @coding_lawyer let component = ReasonReact.reducerComponent("Game"); let make = _children => { ...component, initialState: () => { board: […], gameState:… }, reducer: (action: action, state: state) => switch (action) { | Restart => … | ClickSquare((id: string)) => … }, render: ({state, send}) => <div className="game"> <Board state onRestart=(_evt => send(Restart)) onMark=(id => send(ClickSquare(id))) /> </div>, };
67. @coding_lawyer let component = ReasonReact.reducerComponent("Game"); let make = _children => { ...component, initialState: () => { board: […], gameState:… }, reducer: (action: action, state: state) => switch (action) { | Restart => … | ClickSquare((id: string)) => … }, render: ({state, send}) => <div className="game"> <Board state onRestart=(_evt => send(Restart)) onMark=(id => send(ClickSquare(id))) /> </div>, };
68. @coding_lawyer let component = ReasonReact.reducerComponent("Game"); let make = _children => { ...component, initialState: () => { board: […], gameState:… }, reducer: (action: action, state: state) => switch (action) { | Restart => … | ClickSquare((id: string)) => … }, render: ({state, send}) => <div className="game"> <Board state onRestart=(_evt => send(Restart)) onMark=(id => send(ClickSquare(id))) /> </div>, };
69. @coding_lawyer let component = ReasonReact.reducerComponent("Game"); let make = _children => { ...component, initialState: () => { board: […], gameState:… }, reducer: (action: action, state: state) => switch (action) { | Restart => … | ClickSquare((id: string)) => … }, render: ({state, send}) => <div className="game"> <Board state onRestart=(_evt => send(Restart)) onMark=(id => send(ClickSquare(id))) /> </div>, };
70. @coding_lawyer let component = ReasonReact.reducerComponent("Game"); let make = _children => { ...component, initialState: () => { board: […], gameState:… }, reducer: (action: action, state: state) => switch (action) { | Restart => … | ClickSquare((id: string)) => … }, render: ({state, send}) => <div className="game"> <Board state onRestart=(_evt => send(Restart)) onMark=(id => send(ClickSquare(id))) /> </div>, };
71. @coding_lawyer let component = ReasonReact.reducerComponent("Game"); let make = _children => { ...component, initialState: () => { board: […], gameState:… }, reducer: (action: action, state: state) => switch (action) { | Restart => … | ClickSquare((id: string)) => … }, render: ({state, send}) => <div className="game"> <Board state onRestart=(_evt => send(Restart)) onMark=(id => send(ClickSquare(id))) /> </div>, };
72. @coding_lawyer let component = ReasonReact.reducerComponent("Game"); let make = _children => { ...component, initialState: () => { board: […], gameState:… }, reducer: (action: action, state: state) => switch (action) { | Restart => … | ClickSquare((id: string)) => … }, render: ({state, send}) => <div className="game"> <Board state onRestart=(_evt => send(Restart)) onMark=(id => send(ClickSquare(id))) /> </div>, };
73. @coding_lawyer Game Board App BoardRow Square
74. @coding_lawyer Game Board App BoardRow Square
75. @coding_lawyer Game Board App BoardRow Square
76. @coding_lawyer Game Board App BoardRow Square
77. @coding_lawyer Game Board App BoardRow Square
78. @coding_lawyer Game Board App BoardRow Square
79. @coding_lawyer Game Board App BoardRow Square
80. @coding_lawyer let component = ReasonReact.reducerComponent("Game"); let make = _children => { ...component, initialState: () => { board: […], gameState:… }, reducer: (action: action, state: state) => switch (action) { | Restart => … | ClickSquare((id: string)) => … }, render: ({state, send}) => <div className="game"> <Board state onRestart=(_evt => send(Restart)) onMark=(id => send(ClickSquare(id))) /> </div>, };
81. @coding_lawyer let component = ReasonReact.reducerComponent("Game"); let make = _children => { ...component, initialState: () => { board: […], gameState:… }, reducer: (action: action, state: state) => switch (action) { | Restart => … | ClickSquare((id: string)) => … }, render: ({state, send}) => <div className="game"> <Board state onRestart=(_evt => send(Restart)) onMark=(id => send(ClickSquare(id))) /> </div>, };
82. @coding_lawyer reducer: (action: action, state: state) => switch (action) { | Restart => ReasonReact.Update(initialState) | ClickSquare((id: string)) => let updatedBoard = updateBoard( state.board, state.gameState, id); let updatedGs = checkGameState3x3( updatedBoard, state.board, state.gameState); ReasonReact.Update({ board: updatedBoard, gameState: updatedGs, }); },
83. @coding_lawyer reducer: (action: action, state: state) => switch (action) { | Restart => ReasonReact.Update(initialState) | ClickSquare((id: string)) => let updatedBoard = updateBoard( state.board, state.gameState, id); let updatedGs = checkGameState3x3( updatedBoard, state.board, state.gameState); ReasonReact.Update({ board: updatedBoard, gameState: updatedGs, }); },
84. @coding_lawyer reducer: (action: action, state: state) => switch (action) { | Restart => ReasonReact.Update(initialState) | ClickSquare((id: string)) => let updatedBoard = updateBoard( state.board, state.gameState, id); let updatedGs = checkGameState3x3( updatedBoard, state.board, state.gameState); ReasonReact.UpdateWithSideEffects( { board: updatedBoard, gameState: updatedGs, }, (_self => Js.log(“Clicked")), ); },
85. @coding_lawyer pure state update and side-effects separation
86. @coding_lawyer less boilerplate
87. @coding_lawyer Redux’s principles and component’s reusability
88. @coding_lawyer type system
89. @coding_lawyer clearer and safer code
90. @coding_lawyer superior to Flow and TypeScript
91. @coding_lawyer type inference
92. @coding_lawyer !/* type inference by the compiler !*/ let plus = (a, b) !=> a + b
93. @coding_lawyer !/* type inference by the compiler !*/ let plus = (a, b) !=> a + b !/* (int, int) !=> int !*/
94. @coding_lawyer type field = | Empty | Marked(player); type gameState = | Playing(player) | Winner(player) | Draw; type player = | Cross | Circle;
95. @coding_lawyer type field = | Empty | Marked(player); type gameState = | Playing(player) | Winner(player) | Draw; type player = | Cross | Circle;
96. @coding_lawyer type field = | Empty | Marked(player); type gameState = | Playing(player) | Winner(player) | Draw; type player = | Cross | Circle;
97. @coding_lawyer type field = | Empty | Marked(player); type gameState = | Playing(player) | Winner(player) | Draw; type player = | Cross | Circle;
98. @coding_lawyer type field = | Empty | Marked(player); type gameState = | Playing(player) | Winner(player) | Draw; type player = | Cross | Circle;
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100. @coding_lawyer pattern matching
101. @coding_lawyer Game Board App BoardRow Square
102. @coding_lawyer reducer: (action: action, state: state) => switch (action) { | Restart => ReasonReact.Update(initialState) | ClickSquare((id: string)) => let updatedBoard = updateBoard( state.board, state.gameState, id); let updatedGs = checkGameState3x3( updatedBoard, state.board, state.gameState); ReasonReact.Update({ board: updatedBoard, gameState: updatedGs, }); },
103. @coding_lawyer let updateBoard = (board: board, gameState: gameState, id) => board |> List.mapi((ind: int, row: row) => row |> List.mapi((index: int, value: field) => string_of_int(ind) ++ string_of_int(index) === id ? switch (gameState, value) { | (Playing(_), Marked(_)) => value | (Playing(player), Empty) => Marked(player) | (_, _) => Empty } : value ) );
104. @coding_lawyer let updateBoard = (board: board, gameState: gameState, id) => board |> List.mapi((ind: int, row: row) => row |> List.mapi((index: int, value: field) => string_of_int(ind) ++ string_of_int(index) === id ? switch (gameState, value) { | (Playing(_), Marked(_)) => value | (Playing(player), Empty) => Marked(player) | (_, _) => Empty } : value ) );
105. @coding_lawyer type field = | Empty | Marked(player); type gameState = | Playing(player) | Winner(player) | Draw;
106. @coding_lawyer /* determines the value of the clicked square */ switch (gameState: gameState, value: field) { | (Playing(_), Marked(_)) => value | (Playing(player), Empty) => Marked(player) | (_, _) => Empty }
107. @coding_lawyer /* determines the value of the clicked square */ switch (gameState: gameState, value: field) { | (Playing(_), Marked(_)) => value | (Playing(player), Empty) => Marked(player) | (_, _) => Empty }
108. @coding_lawyer /* determines the value of the clicked square */ switch (gameState: gameState, value: field) { | (Playing(_), Marked(_)) => value | (Playing(player), Empty) => Marked(player) | (_, _) => Empty }
109. @coding_lawyer /* determines the value of the clicked square */ switch (gameState: gameState, value: field) { | (Playing(_), Marked(_)) => value | (Playing(player), Empty) => Marked(player) | (_, _) => Empty }
110. @coding_lawyer /* determines the value of the clicked square */ switch (gameState: gameState, value: field) { | (Playing(_), Marked(_)) => value | (Playing(player), Empty) => Marked(player) | (_, _) => Empty }
111. @coding_lawyer /* determines the value of the clicked square */ switch (gameState: gameState, value: field) { | (Playing(_), Marked(_)) => value | (Playing(player), Empty) => Marked(player) | (_, _) => Empty }
112. @coding_lawyer /* determines the value of the clicked square */ switch (gameState: gameState, value: field) { | (Playing(_), Marked(_)) => value | (Playing(player), Empty) => Marked(player) | (_, _) => Empty }
113. @coding_lawyer /* determines the value of the clicked square */ switch (gameState: gameState, value: field) { | (Playing(_), Marked(_)) => value | (Playing(player), Empty) => Marked(player) /* | (_, _) => Empty */ }
114. @coding_lawyer
115. @coding_lawyer switch ( getWinner(flattenBoard, head), gameEnded(flattenBoard), tail, ) { | (Cross, _, _) => Winner(Cross) | (Circle, _, _) => Winner(Circle) | (_, true, []) => Draw | (_, false, []) => whosPlaying(gameState) | _ => check(tail) };
116. @coding_lawyer switch (match$1) { case 0 : return /* Winner */Block.__(1, [/* Cross */0]); case 1 : return /* Winner */Block.__(1, [/* Circle */1]); case 2 : if (match$2) { if (tail) { _rest = tail; continue ; } else { return /* Draw */0; } } else if (tail) { _rest = tail; continue ; } else { return whosPlaying(gameState); } }
117. @coding_lawyer Why should you use React in Reason?
118. @coding_lawyer Reason is compatible with React's principles
119. @coding_lawyer strong type system
120. @coding_lawyer pattern matching
121. @coding_lawyer functional programming features
122. @coding_lawyer stateless and stateful component separation
123. @coding_lawyer JavaScript-like syntax React friendly
124. @coding_lawyer Get your hands dirty! sketch.sh
125. @coding_lawyer 
 codinglawyer.io @coding_lawyer
126. @coding_lawyer Thank You
127. @coding_lawyer @coding_lawyer codinglawyer.io github.com/codinglawyer/reason-tic-tac-toe