Answers for "get key array using array unique"

javascript get unique values from key

const unique = [...new Set(array.map(item => item.age))];

find unique value on array

const a = [1, 9, 2, 2, 3, 4, 1, 7, 8, 0, 9, 0, 1, 5, 3];

const b = a.filter(function (item, index, array) {
    return array.lastIndexOf(item) === index; // this will return the unique elements
});