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xpqz / learnapl

Introduction to Dyalog APL: https://xpqz.github.io/learnapl
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Iota Underbar #17

Closed ghost closed 2 years ago

ghost commented 2 years ago

⍸ isn't touched on in great enough extent.

There is a passing comment here - "Note that there is another glyph that looks similar, iota underbar, ⍸, that does something entirely different, so don’t confuse the two!" (And the Finding Thing's section)

Monadic ⍸ is a common way of filtering (especially in trains), besides coming up often in many popular problems for beginners (such as Project Euler), further, dyadic ⍸ is a confusing concept at first which may benefit from a thorough explanation.

Unlike other omitted symbols such as ○,⌹,⍟ & ! - iota underbar's ideas are unique to APL and may be useful for a beginner to be introduced to.

xpqz commented 2 years ago

Fixed in 6a46e0547607c4f3882c2ec9e67948be17b8184c