Processing should define Array just like it has Vector

[quark]

I suggest that you rename this discussion to

p5.js should define Array …

You can see that some responders are thinking you mean Processing Java mode.

Multi-dimensional arrays are not native to Javascript or Java so syntax like

@project_2501

create
var arr = new Array(5,5);

access
var x = arr[3,2];

update
arr[2,2] = 5;

is not possible because it would mean rewriting the Javascipt or Java language.