Actually I have been very impressed with how efficient Perl is on performance. Memory, well that is another story. But try this: 
foreach (1..1000000) {
    $str .= "hello\n";
}

[download]
Now try its equivalent in another language, like C++, JavaScript, etc.

Impressed yet? You should be!

In reply to RE (tilly) 2: Storing data in Array by tilly
in thread Storing data in Array by Anonymous Monk

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