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annotate react_games/src/TODO/main.tsx @ 68:70ca1d99f3fd

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Mimicing what tsoding did for his video. Kinda cool.
author June Park <parkjune1995@gmail.com>
date Thu, 25 Dec 2025 20:03:51 -0800
parents fb9bcd3145cb
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fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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1 /*
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2 * đź“ť React Todo App Challenge (1 Hour)
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3 * âť“Problem
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4 * Build a simple Todo application using React. The app should allow users to:
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5 *
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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6 * - Add a new todo item.
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7 *
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8 * - Mark a todo as completed.
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9 *
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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10 * - Delete a todo.
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11 *
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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12 * Filter todos by:
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13 *
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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14 * - All
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15 * - Active
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16 * - Completed
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17 *
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18 * đź’ˇBonus (if time allows)
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19 * Persist todos in localStorage.
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20 *
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21 * Use React Context + useReducer to manage global state.
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22 *
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23 * Add a clear completed button.
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24 *
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25 * 📦 Requirements
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26 * Use functional components + hooks only.
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27 *
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28 *
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29 *
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30 * No styling is required, but if you have time, make it readable.
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31 *
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32 * Don’t use external state management libraries like Redux.
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33 *
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34 * Components
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35 *
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36 * TODOs
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37 * Inputs
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38 * buttons filtering
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39 *
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40 * TODO States
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41 * - Active
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42 * - Completed
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43 * - Deleted
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44 */
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45 import React, { CSSProperties, Dispatch, InputHTMLAttributes, memo, useMemo, useRef, useState } from "react";
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46
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47 enum TodoState {
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48 ACTIVE="active",
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49 COMPLETED="completed",
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50 DELETED="deleted",
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51 }
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52
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53 interface Todo {
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54 id: string;
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55 value: string;
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56 state: TodoState;
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57 }
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58
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59 const INITIAL_TODOS: Todo[] = [
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60 {id: "1", value: "I want to buy pizza", state: TodoState.ACTIVE},
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61 {id: "2", value: "I want to buy pizza completed", state: TodoState.COMPLETED},
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62 {id: "3", value: "I want to buy pizza deleted", state: TodoState.DELETED},
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63 ]
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64
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65 function changeStateTodo(
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66 todoId: string,
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67 todoState: TodoState,
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68 setTodoCallback: Dispatch<React.SetStateAction<Todo[]>>,
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69 ): void {
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70 setTodoCallback(
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71 (todos: Todo[]) => todos.map((todo: Todo) => {
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72 if (todo.id === todoId) {
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73 return {
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74 ...todo,
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75 state: todoState
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76 };
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77 }
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78 return todo;
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79 })
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80 )
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81 }
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82
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83 interface TodoComponentProp {
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84 todo: Todo;
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85 setTodos: Dispatch<React.SetStateAction<Todo[]>>;
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86 }
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87
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88 const TodoComponent = memo(({todo, setTodos}: TodoComponentProp) => {
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89 const tdStyle: CSSProperties = {
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90 padding: "0.5rem",
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91 borderBottom: "1px solid #ddd",
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92 };
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93
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94 const rowStyle: CSSProperties = {
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95 backgroundColor: "#fff",
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96 };
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97
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98 return (
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99 <tr key={todo.id} style={rowStyle}>
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100 <td style={tdStyle}>{todo.value}</td>
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101 <td style={tdStyle}>
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102 <span style={{ textTransform: "capitalize" }}>{todo.state}</span>
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103 </td>
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104 <td style={tdStyle}>
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105 {todo.state !== TodoState.COMPLETED && (
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106 <button onClick={() => changeStateTodo(todo.id, TodoState.COMPLETED, setTodos)}>
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107 âś…
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108 </button>
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109 )}
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110 {todo.state !== TodoState.DELETED && (
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111 <button onClick={() => changeStateTodo(todo.id, TodoState.DELETED, setTodos)}>
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112 🗑️
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113 </button>
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114 )}
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115 {todo.state !== TodoState.ACTIVE && (
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116 <button onClick={() => changeStateTodo(todo.id, TodoState.ACTIVE, setTodos)}>
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117 🟢
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118 </button>
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119 )}
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120 </td>
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121 </tr>
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122 )
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123 })
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124
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125 const TODO = () => {
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126 const [todos, setTodos] = useState<Todo[]>(INITIAL_TODOS);
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127 const [todoFilter, setTodoFilters] = useState<TodoState | null>(null);
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128 const inputRef = useRef<HTMLInputElement>(null);
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129
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130 const style: CSSProperties = {
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131 display: "flex",
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132 justifyContent: "center",
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133 alignItems: "center",
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134 height: "100vh",
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135 width: "100vw",
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136 }
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137
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138 const filterTodos = useMemo(() => {
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139 return todoFilter ? todos.filter((t) => t.state === todoFilter) : todos;
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140 }, [todos, todoFilter]);
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141
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142 const handleCreateTodo = (event: React.FormEvent) => {
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143 event.preventDefault();
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144 const input = inputRef.current;
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145 if (!input || !input.value.trim()) return;
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146
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147 const newValue = input.value.trim();
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148 setTodos(
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149 (todos) => [
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150 ...todos,
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151 {
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152 value: newValue,
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153 id: crypto.randomUUID(),
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154 state: TodoState.ACTIVE
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155 }
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156 ]
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157 );
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158 input.value = "";
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159 }
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160
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161 const thStyle: CSSProperties = {
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162 textAlign: "left",
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163 padding: "0.5rem",
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164 backgroundColor: "#f0f0f0",
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165 borderBottom: "2px solid #ddd",
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166 };
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167
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168 const buttonStyle = (isActive: boolean): CSSProperties => {
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169 return {
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170 padding: "0.5rem 1rem",
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171 borderRadius: "6px",
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172 border: "1px solid #ccc",
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173 backgroundColor: isActive ? "#efefef" : "#fff",
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174 marginBottom: "1rem",
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175 }
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176 };
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177
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178 return (
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179 <div style={style}>
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180 <div>
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181 <h1> TODOs: </h1>
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182 <h2> Filter by: {todoFilter != null ? todoFilter : "All"} </h2>
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183 <div style={{display: "flex", width: "100%", justifyContent: "space-between"}}>
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184 <button style={buttonStyle(todoFilter===TodoState.ACTIVE)} onClick={() => setTodoFilters(TodoState.ACTIVE)}> Active </button>
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185 <button style={buttonStyle(todoFilter===TodoState.DELETED)} onClick={() => setTodoFilters(TodoState.DELETED)}> Deleted </button>
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186 <button style={buttonStyle(todoFilter===TodoState.COMPLETED)} onClick={() => setTodoFilters(TodoState.COMPLETED)}> Completed </button>
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187 <button style={buttonStyle(todoFilter===null)} onClick={() => setTodoFilters(null)}> ALL </button>
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188 </div>
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189 <table style={{ borderCollapse: "collapse", width: "100%", marginBottom: "1rem" }}>
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190 <thead>
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191 <tr>
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192 <th style={thStyle}>Task</th>
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193 <th style={thStyle}>Status</th>
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194 <th style={thStyle}>Action</th>
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195 </tr>
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196 </thead>
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197 <tbody>
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198 {
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199 filterTodos.map((todo) => (
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200 <TodoComponent key={todo.id} todo={todo} setTodos={setTodos}/>
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201 ))
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202 }
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203 </tbody>
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204 </table>
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205 <form onSubmit={handleCreateTodo}>
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206 <input ref={inputRef} placeholder={"Add a new todo..."} style={{
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207 padding: "0.5rem",
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208 border: "1px solid #ccc",
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209 borderRadius: "4px",
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210 width: "300px",
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211 marginRight: "0.5rem",
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212 }}
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213 />
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214 <button type="submit" style={{ padding: "0.5rem 1rem", borderRadius: "4px" }}>Add</button>
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215 </form>
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216 </div>
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217 </div>
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218 );
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219 }
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220
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221 export {
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222 TODO
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223 }