map and grep are very different beasts, cause the block is NOT handled like an anonymous sub but more like a do-block.

  DB<117> sub tst { map {$_[$_]+1} 0..3 }

  DB<118> tst 1..10
 => (2, 3, 4, 5)

[download]

But your code with reduce didn't work for me, it always returned 0 cause thats the smallest index you passed. 1 cause ... ¹

Could you show us an example and tell us which versions you use?

Cheers Rolf

( addicted to the Perl Programming Language)

¹) @_=(BLOCKREF, indices) 

  DB<148> @a=  map { int rand 100 } 1..5
 => (32, 4, 90, 79, 70)

  DB<149> sub minindex { reduce { print "@_\t$a:$_[$a],$b:$_[$b]\n"; $
+_[$a] < $_[$b] ? $a : $b } 0 .. $#_ }

  DB<150> minindex @a
CODE(0xa353ea8) 0 1 2 3 4    0:CODE(0xa353ea8),1:0
CODE(0xa353ea8) 0 1 2 3 4    1:0,2:1
CODE(0xa353ea8) 0 1 2 3 4    1:0,3:2
CODE(0xa353ea8) 0 1 2 3 4    1:0,4:3
 => 1

[download]

In reply to Re^8: index of the minimum element of the array by LanX
in thread index of the minimum element of the array by Anonymous Monk

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