! Enumeration

Enumerated symbol list

x!y    ![x;y]

Where

• x is a handle to a symbol list
• y is an int vector in the domain til count x

returns an enumerated symbol list. Enumeration is a uniform function.

q)x:`a`b`c`d
q)`x!1 2 3
`x$`b`c`d

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Enum Extend, Enumerate, ! bang
Enumerations
Q for Mortals §7.5 Enumerations, §8.5 Foreign Keys and Virtual Columns