Can not see why this isn’t working.
This is a react.js app
App.js
import {useState} from "react";
import './App.css';
function App() {
const [age, setAge] = useState(0);
const [inputValue, setInputValue] = useState("");
const [showText, setShowText] = useState(true);
const [textColor, setTextColor] = useState("blue");
const [count, setCount] = useState(0);
const [todoList, setTodoList] = useState([]);
const [newTask, setNewTask] = useState("");
const increaseAge = () => {
setAge(age + 1);
};
const decreaseAge = () => {
setAge(age - 1);
};
const increaseAgeten = () => {
setAge(age + 10);
};
const decreaseAgeten = () => {
setAge(age - 10);
};
const increaseAgehundred = () => {
setAge(age + 100);
};
const decreaseAgehundred = () => {
setAge(age - 100);
};
const handleInputChange = (event) =>{setInputValue(event.target.value)}
const increase = () => {
setCount(count + 1)
};
const decrease = () => {
setCount(count - 1)
};
const setToZero = () => {
setCount(0)
};
const handleChange = (event) => {
setNewTask(event.target.value);
};
const addTask = () => {
const newTodoList = [...todoList, newTask];
setTodoList(newTodoList);
};
return (
<div className="App">
<div className="addTask">
<input onChange={handleChange}/>
<button onClick={addTask}>Add Task</button>
</div>
<div className="List">
todoList.map((task) => {
return <h1>(task)</h1>;
}
</div>
{age}
<br></br>
<button onClick={increaseAge}>+1</button>
<button onClick={decreaseAge}>-1</button>
<br></br>
<button onClick={increaseAgeten}>+10</button>
<button onClick={decreaseAgeten}>-10</button>
<br></br>
<button onClick={increaseAgehundred}>+100</button>
<button onClick={decreaseAgehundred}>-100</button>
<br></br>
<input type="text" onChange = {handleInputChange}/>
{inputValue}
<br></br>
<button onClick={() => {setShowText(!showText)}}>
Show/Hide
</button>
{showText && <h1>Shane</h1>}
<button
onClick={() => {setTextColor(textColor === "blue" ? "red" : "blue");}}>Change colour
</button>
{<h1 style={{ color: textColor }}>Blah</h1>}
<button onClick={increase}>Increase</button>
<button onClick={decrease}>Decrease</button>
<button onClick={setToZero}>Reset</button>
<br></br>
{count}
</div>
);
}
export default App;
The error shows some problem with return on line 60
58 | <div className="List">
59 | todoList.map((task) => {
> 60 | return <h1>(task)</h1>;
| ^
61 | }
This was from youtube tutorial https://youtu.be/f55qeKGgB_M?t=6273
2
Answers
You probably want:
Or:
This is the right syntax :
Don’t forget to use the second parameter on the map function to give an unique
key
to each child.