Could String internalize an ArrayBuffer?
bzbarsky at mit.edu
Sun Dec 6 05:19:49 UTC 2015
On 12/5/15 8:44 AM, Coroutines wrote:
> What I want is to be able to view a String through a typed array
> without duplicating the memory/contents of that string.
The big problem with this is that the actual in-memory representations
of strings and arraybuffers can be quite different in implementations
For example, strings typically have a complicated representation that
involves multiple fragments, ropes, etc, to make string concatenation
fast. Not only that, but to save memory in various engines some strings
that only contain values less than 256 are stored with underlying 8-bit
units, not 16-bit ones. There has also been talk of using something
like UTF-8 for the internal string representation in some engines, to
reduce the impedance mismatch with engine consumers (like a browser
Arraybuffers, on the other hand, are typically an actual contiguous
chunk of memory to make access fast. And of course they just exposed
whatever bytes they contain.
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