将一维数组转换为二维“行”数组

Question

我需要在javascript中将一维数组更改为二维“行”数组：var row1D = [“A”、“B”、“C”、“D”、“E”]；必须改为：var row2D = [["A", "B", "C", "D", "E"]]; 我该如何解决这个问题？（我将其更改为二维“列”数组的示例： var column2D = [["A"], ["B"], ["C"], ["D"], ["E"]] )var column2D = [];  for (var i = row1D.length; i--;) {    column2D[i] = [row1D[i]];  }

Answer 1

只需包装数组，而不是项目。

column2D = [row1D];

Answer 2

使用map并包装数组中的每个元素

var row1D = ["A", "B", "C", "D", "E"];

var row2D = row1D.map(x => [x]);

console.log(row2D);

Answer 3

将一维数组转换为二维“行”数组：

谢谢！这就是我的解决方案！

var row1D = ["A", "B", "C", "D", "E"];

var row2D = [];

  for (var i = row1D.length; i--;) {

    row2D = [row1D];

  }