Can you have untyped arrays on Asm.js?

Question

For example, is it possible to construct the following array on Asm.js:

var arr = [1,2,[3,4],"test"];

Answer 1

No. asm.js uses a single ArrayBuffer for its memory heap. It does not support nested arrays (although you can have overlapping typed arrays using the same buffer) nor strings. That said you could handle a c-style string yourself, but the asm.js module could only access it as bytes.