Is there an easier way to swap two values in an array?

This works:

$ perl -le '@a=(1,2,3,4) ; ($a[0],$a[1])=($a[1],$a[0]) ;   print
join("\t", @a) ; '
2       1       3       4

This doesn't:

$ perl -le '@a=(1,2,3,4) ; $a[0,1]=$a[1,0] ;   print join("\t", @a) ; '
1       1       3       4

Regards,
- Robert

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