Re: Reduce [was: Re: Random items (old p5p issues)]

[Randal L. Schwartz]

>>>>> "Ariel" == Ariel Scolnicov <[EMAIL PROTECTED]> writes:

Ariel> reduce needs to be able to take an (optional?) "distinguished element" 
Ariel> to start from.  Consider this:

Ariel>    reduce sum () == 0
Ariel>    reduce times () == 1
Ariel>    reduce catenate () == ''

Ariel> Where do we get the right one from?

In Smalltalk, it's called "inject:into:", and yes, you're providing
both a distinguished "initial" value, and a 2-argument block, along
with the list to process.

"smalltalk: " result _ (1 to: 10) inject: 0 into: [:a :b | a + b] "this is sum"

"perl: "; @result = reduce { $a + $b } 0, (1..10); # sum

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