How can I get an element of a sequence?
For example Sequence[a,b,c,d]
How can get c?

  • 3
    $\begingroup$ Wrap it in a list and then take parts of that list? $\endgroup$
    – J. M.'s torpor
    Feb 4 at 0:36
  • $\begingroup$ @J.M. yes, I did that before but was wondering if that is how people normally do it. $\endgroup$
    – emnha
    Feb 4 at 0:47
  • 6
    $\begingroup$ Part is more natural. But you can also use Slot: i.e., #3 &@Sequence[a, b, c, d]. $\endgroup$
    – kglr
    Feb 4 at 1:05
  • $\begingroup$ With Part are you talking about the method that J. M. mentioned above? @kglr $\endgroup$
    – emnha
    Feb 5 at 10:14
  • $\begingroup$ that's right... $\endgroup$
    – kglr
    Feb 5 at 12:34
seq = Sequence[a, b, c, d]
Sequence[a, b, c, d]

You can use a composition of Part ([[...]]) and List as suggested by J.M.'sennui:

(Part[#, 3] & @* List)[seq]

Alternatively, you can use Slot[3] (that is, #3):

#3 & @ seq
Slot[3] &[seq]
  • $\begingroup$ Is there any advantage of writing (Part[#, 3] & @* List)[seq] instead of {seq}[[3]]? $\endgroup$
    – emnha
    Feb 8 at 7:37
  • 1
    $\begingroup$ @anhnha, can't think of any. $\endgroup$
    – kglr
    Feb 8 at 8:13

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