flat-array-unique-sort.js

// https://www.bilibili.com/video/BV1BL411K7Dy

const arr = [
    [1, 2, 2],
    [3, 4, 5, 5],
    [6, 7, 8, 9,
        [11, 12,
            [12, 12,
                [13]
            ]
        ]
    ],
    10
];

Array.prototype.myFlat = function () {
    const result = [];
    this.forEach(item => {
        if (Array.isArray(item)) {
            item.myFlat().forEach(x => result.push(x));
        } else {
            result.push(item);
        }
    })
    return result;
}
Array.prototype.myUnique = function() {
    return Array.from(new Set(this));
}


const compareFn = (a,b) => a-b;
console.log(arr.myFlat());
console.log(arr.myFlat().myUnique());
console.log(arr.myFlat().myUnique().sort(compareFn));

// 如果myFlat() 传入一个 Set，那么 flat， unique 可以同时实现