HighOrder

/*
Implement unique - return the unique elements, based on a passed selector
    const unique = (arr, selector) => {}
    const numbers = [1,1,3,2,1,2,3];
    console.log(unique(numbers, n => n)); // [1, 3, 2]

   const pets = [
        { type: 'dog', name: 'sharo' },
        { type: 'cat', name: 'maca' },
        { type: 'dog', name: 'balkan' }
    ];

    const uniqueByType = unique(pets, p => p.type);
    // [{ type: 'dog', name: 'sharo' }, { type: 'cat', name: 'maca' }]
 */

const pets = [
    { type: 'dog', name: 'sharo' },
    { type: 'cat', name: 'maca' },
    { type: 'dog', name: 'balkan' }
];

const unique = (arr, selector) => {
    const selected = arr.map(selector)

    const result = selected.reduce((acc, el) => {
        if (typeof arr[0] != 'object') {
            if (!acc.includes(el)) {
                acc = [...acc, el]
            }
        } else {
            if (!acc.some(obj => obj.type === el)) {
                acc.push({ type: el, name: arr.find(e => e.type === el).name })
            }
        }

        return acc;
    }, [])

    return result
}

console.log(unique([1, 1, 2, 1, 3, 4, 5], n => n))
console.log(unique(pets, n => n.type))