Created
August 29, 2020 14:12
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A to-do app written with React
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import React from "react"; | |
function Todos({ todos: originalTodos }) { | |
const filters = ["all", "active", "done"]; | |
const [input, setInput] = React.useState(""); | |
const [todos, setTodos] = React.useState(originalTodos || []); | |
const [activeFilter, setActiveFilter] = React.useState(filters[0]); | |
const addTodo = (e) => { | |
if (e.key === "Enter" && input.length > 0) { | |
setTodos((todos) => [{ name: input, done: false }, ...todos]); | |
setInput(""); | |
} | |
}; | |
const filteredTodos = React.useMemo( | |
() => | |
todos.filter((todo) => { | |
if (activeFilter === "all") { | |
return todo; | |
} | |
if (activeFilter === "active") { | |
return !todo.done; | |
} | |
return todo.done; | |
}), | |
[todos, activeFilter] | |
); | |
const toggle = (index) => { | |
setTodos((todos) => | |
todos.map((todo, i) => | |
index === i ? { ...todo, done: !todo.done } : todo | |
) | |
); | |
}; | |
const remove = (index) => { | |
setTodos((todos) => todos.filter((todo, i) => i !== index)); | |
}; | |
return ( | |
<div> | |
<h2 className="title">To-dos</h2> | |
<input | |
className="input" | |
onChange={(e) => setInput(e.target.value)} | |
onKeyDown={addTodo} | |
value={input} | |
placeholder="Add something..." | |
/> | |
<ul className="list-todo"> | |
{filteredTodos.length > 0 ? ( | |
filteredTodos.map(({ name, done }, i) => ( | |
<li key={`${name}-${i}`} className="todo-item"> | |
<input | |
type="checkbox" | |
checked={done} | |
onChange={() => toggle(i)} | |
id={`todo-${i}`} | |
/> | |
<div className="todo-infos"> | |
<label | |
htmlFor={`todo-${i}`} | |
className={`todo-name ${done ? "todo-name-done" : ""}`} | |
> | |
{name} | |
</label> | |
<button className="todo-delete" onClick={() => remove(i)}> | |
Remove | |
</button> | |
</div> | |
</li> | |
)) | |
) : ( | |
<p className="no-results">No to-dos!</p> | |
)} | |
</ul> | |
<ul className="list-filters"> | |
{filters.map((filter) => ( | |
<li | |
key={filter} | |
className={`filter ${ | |
activeFilter === filter ? "filter-active" : "" | |
}`} | |
onClick={() => setActiveFilter(filter)} | |
> | |
{filter} | |
</li> | |
))} | |
</ul> | |
</div> | |
); | |
} | |
export default Todos |
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