Re: hash and arrays

Everybody else gave useful answers. I simply can't help myself.

=> is used when you want to compute a minimum; as, for example, [ $a => $b ]->[ $b <= $a ].

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Re^2: hash and arrays by repellent (Priest) on Nov 11, 2008 at 08:13 UTC
Not quite true. I will not recommend the use of `[ $a => $b ]->[ $b <= $a ]` [download] as it relies on too much syntax magic. The first set of brackets `[ ]` is used to indicate an anonymous array, whereas the second set of brackets `->[ ]` de-references the array. `=>` is used as a fat comma (not greater-than-or-equal-to), whereas `<=` is used as less-than-or-equal-to. Hence, `[ $a => $b ]->[ $b <= $a ] is same as [ $a, $b ]->[ ($b <= $a) ] which either evaluates to [ $a, $b ]->[0] # returning $a or [ $a, $b ]->[1] # returning $b` [download]	[reply] [d/l] [select]

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Re^2: hash and arrays
by repellent (Priest) on Nov 11, 2008 at 08:13 UTC

not

[ $a => $b ]->[ $b <= $a ]
[download]

[ ]

->[ ]

=>

<=

[ $a => $b ]->[ $b <= $a ]

is same as

[ $a, $b ]->[ ($b <= $a) ]

which either evaluates to

[ $a, $b ]->[0]  # returning $a
or
[ $a, $b ]->[1]  # returning $b
[download]

[reply]
[d/l]
[select]