Splice

Splice[{e₁,e₂,…}]

represents an expression that will automatically be spliced into any list in which it appears as the sequence of elements e_i.

Details

Splice[{}] is equivalent to Nothing.
Splice[{e₁,e₂,…}] is equivalent to Sequence[e₁,e₂,…] when the outer wrapping head is List.
Splice is resolved as part of the standard evaluation process. It is not resolved in expressions that are held or inactive.

open allclose all

Give a list of elements to be spliced into a surrounding list:

Splice expressions do not automatically flatten inside other heads:

Flatten a list of lists inside another list:

Splice a list into another list:

Splice[{e₁,e₂,…}] behaves like Sequence[e₁,e₂,…] inside a list:

Sequence objects also splice inside other heads, but not Splice objects:

Splice[{}] is equivalent to Nothing:

FlattenAt[list,pos] is equivalent to MapAt[Splice,list,pos]:

Top