없는 숫자 더하기

// javascript
const solution = (numbers) => {
    const numberArr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
    return numberArr
        .filter(num => !numbers.includes(num))  
        .reduce((acc, curr) => acc + curr, 0);  
};

 

// typescript
const solution = (numbers: number[]): number => {
    const numberArr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
    return numberArr
        .filter(num => !numbers.includes(num)) 
        .reduce((acc, curr) => acc + curr, 0); 
};