Re^2: Re^6.1: how to avoid full scan in file.

It was great. The result of the script has showed is the same. Thank you. But I am little confusing about your code because there is some part I never have seen and I barely understand it. I do not know for where I have to start to see. Can you indicate any book or we can change some ideas about it? Send me a inbox message.

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Re^3: Re^6.1: how to avoid full scan in file. by poj (Abbot) on May 26, 2019 at 07:53 UTC
If it's the use of hashes that is new to you then Perl Intro and References are good places to start. Use of the default loop variable `$_` in the last code block is explained in Perl Variables For example, in your code `foreach my $line ( @B ) { $k++; my $idx1= @$line[0].@$line[1].@$line[2];` [download] could be written using the default variable `$_` as `foreach ( @B ) { $k++; my $idx1 = $_->[0].$_->[1].$_->[2];` [download] poj	[reply] [d/l] [select]

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Re^3: Re^6.1: how to avoid full scan in file.
by poj (Abbot) on May 26, 2019 at 07:53 UTC

If it's the use of hashes that is new to you then Perl Intro and References are good places to start.

Use of the default loop variable $_ in the last code block is explained in Perl Variables

For example, in your code

foreach my $line ( @B ) {
   $k++;
   my $idx1= @$line[0].@$line[1].@$line[2];
[download]

could be written using the default variable $_ as

foreach ( @B ) {
   $k++;
   my $idx1 = $_->[0].$_->[1].$_->[2];
[download]

[reply]
[d/l]
[select]