合并/展平数组数组

2022-01-19 00:00:00 arrays multidimensional-array flatten frontend javascript

我有一个 JavaScript 数组，例如:

I have a JavaScript array like:

[["$6"], ["$12"], ["$25"], ["$25"], ["$18"], ["$22"], ["$10"]]

我将如何将单独的内部数组合并为一个:

How would I go about merging the separate inner arrays into one like:

["$6", "$12", "$25", ...]

推荐答案

可以使用concat合并数组:

var arrays = [
  ["$6"],
  ["$12"],
  ["$25"],
  ["$25"],
  ["$18"],
  ["$22"],
  ["$10"]
];
var merged = [].concat.apply([], arrays);

console.log(merged);

使用 concat 的 apply 方法只会将第二个参数作为一个数组，所以最后一行与此相同:

Using the apply method of concat will just take the second parameter as an array, so the last line is identical to this:

var merged2 = [].concat(["$6"], ["$12"], ["$25"], ["$25"], ["$18"], ["$22"], ["$10"]);

<小时>

还有 Array.prototype.flat() 方法(在 ES2019 中引入)，您可以使用它来展平数组，尽管 它仅在 Node.js 11 开始可用，而在 Internet Explorer 中根本不可用.

const arrays = [
      ["$6"],
      ["$12"],
      ["$25"],
      ["$25"],
      ["$18"],
      ["$22"],
      ["$10"]
    ];
const merge3 = arrays.flat(1); //The depth level specifying how deep a nested array structure should be flattened. Defaults to 1.
console.log(merge3);

相关文章