Each operator
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¨

Each (¨
) is a primitive monadic operator which applies its operand to each element of the arguments, and returns an array whose elements are the results. If two arguments are given, their elements are matched using conformability rules.
Each is defined only in nested APLs. Some flat APLs obtain analogous functionality by using an Under operator with close composition along with the rank0 function Disclose (or Unbox). In SHARP APL this is written f¨>
. In J it is f&.>
.
Each differs from the Rank operator with rank 0 in that the operand arguments and results are not enclosed. As the elements of a nested array they need not be scalar.
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Lessons
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APL builtins [edit]  

Primitive functions  
Scalar  
Monadic  Conjugate ∙ Not ∙ Roll ∙ Type  
Dyadic  Plus ∙ Equal to (Xnor) ∙ Not Equal to (Xor)  
NonScalar  
Structural  Shape ∙ Reshape ∙ Depth ∙ Ravel ∙ Reverse  
Selection  Take ∙ Drop ∙ Unique  
Selector  
Computational  
Primitive operators  Each  
Quad names  
Constants  Index origin ∙ Migration level  
Functions  
Operators  
Other  Zilde ∙ High minus 