in reply to Re: Re: Re: "foreach" is to "next" as "map" is to ???
in thread "foreach" is to "next" as "map" is to ???

Yeah, but my situation here was sort of like moving from middle-school straight to college.

I'm pretty comfortable with looping, scalars and arrays, simple sorting, that sort of thing, but all of a sudden Sort array according to a value in each element? I needed some really heavy code.

I have an aversion to using code that I don't understand, so I set out to understand the GRT, one chunk at a time.

I learned a lot fast. Next to study is "the empty list technique"...
  • Comment on Re: Re: Re: Re: "foreach" is to "next" as "map" is to ???

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Empty list technique (was Re*: "foreach" is to "next" as "map" is to ???)
by Roy Johnson (Monsignor) on May 26, 2004 at 19:35 UTC
    To help understand the empty list technique, look at this code, guess what it will output, and then try it. 
    my @a=((),(),());
printf "%d\n", scalar @a;

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    List flattening is the key. A little more directly: 
    printf "%d\n", scalar map {()} 1..3;

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