Disable submit button if element found in array in react - reactjs

Question

I want to disable the submit button on the form if the user enters a value that already exists in the task list.
'Todos' is the array that stores the list and I used 'some' to check if the input value is equal to some title. However, it doesn't work.
CODE
const [disable, setDisable] = useState(false);
const onFormSubimit = (event) => {
event.preventDefault();
if (!editTodo) { //mudar depois a condição
setTodos([...todos, {
id: uuidv4(),
title: input,
completed: false
}]);
setInput("");
} else {
updateTodo(input, editTodo.id, editTodo.completed);
}
}
const handleInputChange = (event) => {
let inputValue = event.target.value;
setInput(inputValue);
getInputValue(inputValue);
}
const getInputValue = (inputValue) => {
let some = todos.some(item => item.title === inputValue);
if (some!=disable) {
setDisable(true);
}
}
return (
<form onSubmit={onFormSubimit}>
<input type='text' name='text' placeholder='Insira o nome da tarefa' className='task-input' value={input} onChange={handleInputChange} required></input>
<button type='submit' className='button-add' disabled={getInputValue} >{editTodo ? 'Alterar' : 'Adicionar'}</button>
</form>
);
}

Answer 1

Your button state is dependent on input (the variable set by setInput) and todos. So the best way to handle this is via an useEffect with a dependency array.
useEffect(() => {
// Array.some returns a boolean
setDisable(todos.some(item => item.title === input))
}, [todos, input]);
Your button code
<button type='submit' className='button-add' disabled={disable} >{editTodo ? 'Alterar' : 'Adicionar'}</button>
You can also directly use this logic in button like below. In this case there is no need of useEffect
<button type='submit' className='button-add' disabled={todos.some(item => item.title === input)} >{editTodo ? 'Alterar' : 'Adicionar'}</button>

Answer 2

First, change your button with the code below (as it should be disabled ={disable}, not disabled={getInputValue}). And getInputValue as following.
<button type='submit' className='button-add' disabled={disable} >{editTodo ? 'Alterar' : 'Adicionar'}</button>
const getInputValue = (inputValue) => {
if (todos.some((item) => item.title === inputValue)) {
setDisable(true);
} else {
setDisable(false);
}
};