Function/Operator Assignment

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A←f assigns the function f to A.
A←op1 assigns the monadic operator op1 to A.
A←op2 assigns the dyadic operator op2 to A.
A is an assignable name, f, op1, and op2 are an arbitrary function, monadic or dyadic operator, respectively.

For example, the function RankEach←⍴∘⍴¨ when applied to an array, returns the number of dimensions of each item.