javascript - 加入前两个元素并创建新数组？

Question

在使用 join() 和 slice() 函数数小时后，我发现您不能在复杂数组上使用任何一个函数。所以我来这里寻求帮助。

我正在尝试获取以下数据:

 var data = [
            ["North", "Tennis",37, 25, 11, 9, 42, 13],
            ["East", "Football", 41, 2, 3, 26, 47, 21],
            ["South", "Rugby", 7, 22, 35, 45, 11, 46],
            ["West", "Rugby", 30, 21, 44, 23, 4, 47],
            ["North East", "Football", 35, 27, 12, 39, 34, 13],
            ["North West", "Football", 23, 4, 41, 35, 9, 47]
        ];

看起来像这样(输出):

var result = [
    ["North: Tennis", 37, 25, 11, 9, 42, 13],
    ["East: Football", 41, 2, 3, 26, 47, 21],
    ["South: Rugby", 7, 22, 35, 45, 11, 46],
    ["West: Rugby", 30, 21, 44, 23, 4, 47],
    ["North East: Football", 35, 27, 12, 39, 34, 13],
    ["North West: Football", 23, 4, 41, 35, 9, 47]
];

任何帮助将不胜感激

Answer 1

当您想要将一个数组转换为另一个数组时，通过获取每个子数组的前两个元素并将它们连接在一起，然后构建一个 .map 原始数组到另一个数组是有意义的通过将其余元素(我们在数组解构期间使用 rest 参数获得)添加到包含连接字符串的新数组来创建新的子数组。

let data = [
  ["North", "Tennis",37, 25, 11, 9, 42, 13],
  ["East", "Football", 41, 2, 3, 26, 47, 21],
  ["South", "Rugby", 7, 22, 35, 45, 11, 46],
  ["West", "Rugby", 30, 21, 44, 23, 4, 47],
  ["North East", "Football", 35, 27, 12, 39, 34, 13],
  ["North West", "Football", 23, 4, 41, 35, 9, 47]
];

let result = data.map(([s1, s2, ...rest]) => [`${s1}: ${s2}`, ...rest]);

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

引用资料:

• Array.prototype.map()
• Array destructuring
• Template literals