Are there any proposals for Tuples?

Brendan Eich brendan at
Wed Apr 10 18:48:36 PDT 2013

Yeah, I wrote which 
included tuples, but after an initially warm reception, TC39 settled 
down to more incemental moves, and binary data emerged.

We've been thinking along the following lines since then, apologies for 

With new Uint32Array(4) you get a reference type instance. Just as with 
typed arrays today, but same goes for structs as for arrays.

With Uint32Array(4) -- note lack of 'new' oeprator -- you would get an 
immutable value type, which could be stack allocated if escape analysis 
allows. This is for the VM to worry about. It's the JS way.


David Bruant wrote:
> Le 03/04/2013 17:54, BelleveInvis a écrit :
>> I mean, a stack-allocated, immutable, simple, value type, for 
>> high-performance uses.
> I think binary data [1] is very close to what you're looking for.
> "stack-allocated" is complicated to ask. It really depends on what the 
> JS "interpreters" decides to do with your variable and I don't think 
> having a construct to express "put that on the stack" would be 
> appropriate for such a high-level language.
> David
> [1]
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