Henry Rich Reveals J with Threads J9.4
The Array Cast
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The Structured Under API Is a Superset of the Ad Operator
The structural under is a very powerful superset of the ad operator. It can either index into an array and make changes there either by with function application or substitution, or it can apply a Boolean mask to an array and use that to either do a substitution or functional application. All right, maybe we should do a whole episode on under at amending j. Geez, Bob, are we blame Technium? That's right. Get over there and get rid of those. I hope those guys listen to this episode.
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