Henry Rich Reveals J with Threads J9.4
The Array Cast
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The Language Semantics of BQN
In most BQN programming, you don't actually end up doing anything like that. So it can actually keep track of what's supposed to be where and then throw out the changes it made while doing the expression. It handles a whole lot of code without having a bunch of messy modifications and imperative stuff that it has to go back over and undo.
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