[].concat(["x","y"],"z") -> 如何获取 [["x","y"],"z" ] 而不是 ["x"、"y"、"z"]？
[].concat(["x","y"],"z") -> How to get [["x","y"],"z"] instead of ["x","y","z"]?
这很奇怪，但我找不到任何简单的解决方案。
注意：我使用了不变性所以我绝对不想修改原始数组（不建议使用push）
[].concat(["x","y"],"z") -> 如何得到 [["x","y"],"z"] 而不是 ["x","y","z"] ?
您可以使用嵌套数组：
> [].concat([["x", "y"]], "z")
[["x", "y"], "z"]
这很奇怪，但我找不到任何简单的解决方案。
注意：我使用了不变性所以我绝对不想修改原始数组（不建议使用push）
[].concat(["x","y"],"z") -> 如何得到 [["x","y"],"z"] 而不是 ["x","y","z"] ?
您可以使用嵌套数组：
> [].concat([["x", "y"]], "z")
[["x", "y"], "z"]