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:''This page is about lookups. See [[Indexing]], [[Indices]], [[Index Generator]], and [[Interval Index]] for other operations named after indices.'' | |||
{{Built-in|Index Of|⍳}} is a [[dyadic]] [[primitive function]] which returns an array of [[index|indices]] where each item in the right [[argument]] appears in the left argument. If some item is not found, the corresponding index returned is one higher than the last index of the left argument. Index Of shares its [[glyph]] <source lang=apl inline>⍳</source> with the monadic primitive function [[Index Generator]]. | {{Built-in|Index Of|⍳}} is a [[dyadic]] [[primitive function]] which returns an array of [[index|indices]] where each item in the right [[argument]] appears in the left argument. If some item is not found, the corresponding index returned is one higher than the last index of the left argument. Index Of shares its [[glyph]] <source lang=apl inline>⍳</source> with the monadic primitive function [[Index Generator]]. | ||