Как оставить 10 элементов в массиве и удалить остальные?

[{}, {}, {}, {}, {}, {}, {}, {}, {}, {}, {}, {}, {}, {}, {}, {}, {}, {}, {},].slice(0, 10)

const data = [1, 2, 3, 4];
data.splice(3);
// или
data.length = 3;

const arr = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]
console.log(arr) // [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]

const newArr = arr.splice(9, 6)
console.log(newArr) // [10,11,12,13,14,15]