What is the right way to remove head of a number?

Asked May 09 '15 at 18:22

Active May 09 '15 at 18:22

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I often have a number for which I want to remove its head, e.g. {1}. I know of two ways to remove the head:

{1}[[1]]
# & @@ {1}

Neither of these methods seem particularly transparent to me. What is the "right" way to do this common transformation?

asked May 09 '15 at 18:22

JeffDror

2

I would do ## & @@ # &, so the same what you've done but more general, your way fails for {1, 2}. – Kuba May 09 '15 at 18:26
2

Or with pattern matching: expr /. _[x__] :> x – Fred Simons May 09 '15 at 18:31
2

Identity @@ {1} or Sequence @@ {1} depending on what you want to achieve... but the others seems transparent enough, too. – Yves Klett May 09 '15 at 18:36

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