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$\begingroup$ ...or use the "vanishing function" variation: Table[If[PrimeQ[k], k^2, ## &[]], {k, 20}] $\endgroup$

J. M.'s missing motivation
– J. M.'s missing motivation

2012-11-13 22:18:09 +00:00
Commented Nov 13, 2012 at 22:18
1

$\begingroup$ @J.M. the vanishing function is very useful in specific circumstances but I personally find it less transparent than the alternatives. Also, it comes with a certain amount of overhead--here, for example, it's almost 50% slower than using Unevaluated@Sequence[]. $\endgroup$

Oleksandr R.
– Oleksandr R.

2012-11-14 14:15:33 +00:00
Commented Nov 14, 2012 at 14:15

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