Question

I wrote some code (about 100 lines) that is working fine on version 5.12.1.
Unfortunately my client is using version 5.10.0. So I tested the code on 5.10.0 and found it doesn’t work!

Where can I find a list of differences between 5.10 and 5.12?

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Edit:

I think the best answer to the question of “Where can I find a list of differences between 5.10 and 5.12” is plusplus‘ comment under the “accepted answer”. For the explanation of the code below, please read Michael Carman’s answer.

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The code that works on 5.12.1 but does not work on 5.10.0 ($contents is still an empty string after running the code)

# read in the first 10 lines.
my $contents = '';
for (my $i = 0; $i < 10 && ! eof; $i++) {
    $contents .= <FILE>;
}

The improved code that works on both versions.

# read in the first 10 lines.
my $contents = '';
my $i = 0;
while (<FILE>) {
    last if $i >= 10;
    $contents .= $_;
    $i++;
} 

Answer 1

Look at the perldoc page. You”ll find the perldelta’s there. Or post your code and have us look at it 😉