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Mathematica > Core Language > Expressions > Evaluation Control > SequenceHold >

BUILT-IN MATHEMATICA SYMBOL

SequenceHold

SequenceHold
is an attribute that specifies that Sequence objects appearing in the arguments of a function should not automatically be flattened out.

The attribute HoldAllComplete prevents Sequence objects from being flattened out.

Out[2]=

The attribute HoldAll does not prevent splicing of sequences:

SequenceHold is also necessary:

Assignment operators are SequenceHold, so that sequences can be returned as results:

Rules have the same property:

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