刷題-1

一、數組扁平化並去重

已知以下數組，編寫一個程序將數組扁平化去併除其中重複部分數據，最終獲得一個升序且不重複的數組。

let arr = [ [1, 2, 2], [3, 4, 5, 5], [6, 7, 8, 9, [11, 12, [12, 13, [14] ] ] ], 10]

結果：

console.log([...new Set(arr.flat(Infinity))].sort((a, b) => {
  return a - b
}));  // [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]

複製代碼

解析：

let arr = [ [1, 2, 2], [3, 4, 5, 5], [6, 7, 8, 9, [11, 12, [12, 13, [14] ] ] ], 10]

// 1. 數組扁平化處理
let arr1 = arr.flat(Infinity)
console.log(arr1); //  [1, 2, 2, 3, 4, 5, 5, 6, 7, 8, 9, 11, 12, 12, 13, 14, 10]

// 2. 數組去重
let arr2 = [...new Set(arr1)]
console.log(arr2); // [1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 10]

// 3.數組排序
let arr3 = arr2.sort((a, b) => {
  return a - b
})
console.log(arr3); //  [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]

複製代碼