为什么人们会说javascript没有二维数组？

Question

Why do people say that javascript doesn't have 2-dimensional arrays? Isn't

[[]]

A 2-dimensional array?

Answer 1

Well, [[]] is an array containing an array. Also, [[1],[2,3]] is an array containing arrays.

Sometimes an array of arrays can be, and is intended to be, interpreted as a 2D array. Other times it's something different.

While js clearly allows an array to contain arrays, it doesn't provide any special support for 2D arrays as a complete data structure. What that means to you as a developer probably depends on what you expect out of a 2D array.