Re: what's faster: use or require

in reply to what's faster: use or require

More things to try out: (in all the examples, foo.pl does not exist)

```
if (1 == 2) {
    use foo;
}
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```
This causes error right after you start your program. Because use forced a require in the BEGIN block, which is executed before the if checking.
```
if ($a == 2) {
    require "foo.pl";
}
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```
You will get an error, but it is about the uninitialized variable $a, not whether foo.pl exists. So things happen in the visually expected sequence.
```
while (1) {}
require foo.pl;
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```
This will cause a warning about the require syntax, but not the existance of foo.pl. That happens right after you start the program, as the first thing Perl will do, is checking syntax, but not whether the module exists (next example shows this more clearly)
```
while (1) {}
require "foo.pl";
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```
This time, the syntax error is removed. It does not cause any error saying the module is not there, which means Perl will only try to load foo.pl at the time when it is really needed, which will never happen, because of the deadloop before the require.

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