The Array Cast cover image

Henry Rich Reveals J with Threads J9.4

The Array Cast

CHAPTER

Immutable Arrays

immutable semantics, but it's very important not to actually implement immutable arrays. You need to do that to reshare to share the memory so that you keep the cache for flow. But on the other hand, you're not dealing with the situation where two threads could simultaneously modify the same array. That seems like a pretty big deal to me.

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