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Revision as of 01:29, 9 July 2022
Find
x?y
The find primitive is used to find the index of an atom y in array x. It returns 0N if the element is not found.
Find is right atomic.
"XYZ"?"XYXZB" 0 1 0 2 0N 5 8 5?56 8 1 5 0N 1 0N 0
For dictionaries, returns the keys associated with the given values:
(`a`b`c`d!23 14 9 5)?9 14 `c`b
K3
In K3, Find is non-atomic. It considers y as a single unit, and will return a single index for it. ?/: is needed to simulate the functionality of later Ks.