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    $\begingroup$ Using ogerard's processing idea, one can use Pick to enhance performance: x = {2, 4, 6, 8, 10}; Pick[Range[Length[x]], Sign[x - 6], 1]. $\endgroup$ Commented Jan 18, 2012 at 20:46
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    $\begingroup$ I've noticed a preference for people below to use PatternTest rather than Condition. Are any performance differences or is it just what people are used to? $\endgroup$ Commented Jan 18, 2012 at 22:15
  • $\begingroup$ I prefer Condition for ease of naming elements to work with them. $\endgroup$ Commented Jan 19, 2012 at 1:05
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    $\begingroup$ This question is a good example of where some effort on WR's part to give useful simple examples in their documentation would make every's life a lot easier. This SHOULD be easy to find in the docs, but it's not. $\endgroup$ Commented May 7, 2016 at 6:13
  • $\begingroup$ just a point-free style {2, 4, 6, 8, 10} // Position[_?(GreaterThan[7])] $\endgroup$ Commented Oct 13, 2023 at 13:02