#Loop through the keys foreachmy$key(@keys){ --->#This is the Main PROBLEM in the code --->%hash=%{$DataHash{$key}}; # Get all the keys of that hash @hashKeys=keys%hash; print"Data:",$hash{ElementName}," "; #Get the items Programs that has been implemented @hashItems=@{...
# LOOP THROUGH IT while (($key, $value) = each(%capitals)){ print $key.", ".$value."\n"; } 输出 Australia, Canberra India, New Delhi USA, Washington, D.C. South Korea, Seoul Perl按键排序哈希 你可以使用其键元素或值元素对哈希进行排序。 Perl为此提供了sort()函数。在此示例中, 我们...
A Perl hash while/each solutionHere's a very similar example, where I again loop through all the elements of a Perl hash, this time using the each and while operators to traverse the hash:#!/usr/bin/perl #--- # create our perl hash #--- $prices{"pizza"} = 12.00; $prices{"coke...
$key (keys %contact) Every time thekeysfunction is called, it grabs a key out of the hash and puts it in the$keystring. When couched in theforeach statementit will loop through each element of the hash and pass the keys off to the print statement. The output of the program will be...
# Loop through all the threads foreach my $thr (threads->list()) { $thr->join(); } If some threads have not finished running when the main Perl thread ends, Perl will warn you about it and die, since it is impossible for Perl to clean up itself while other threads are running. ...
程序设计语言通常不构成安全风险，风险是由程序员带来的。几乎每种语言都有某些缺陷，这些缺陷在某种程度...
I _know_ this is ugly, and I want to learn how to make this type of looping more efficient, especially from a code maintenance standpoint. The loops where I test if the barcode is enabled and then call a routine would be nice to just have one in the program and loop through all the...
name'...)". The backreference may then be written as"\g{name}". It is permissible to attach the same name to more than one group, but then only the leftmost one of the eponymous set can be referenced. Outside of the pattern a named capture group is accessible through the"%+"hash....
If the "switch" feature is enabled, "continue" is also a function that exits the current "when" (or "default") block and falls through to the next one. See feature and "Switch statements" in perlsyn for more information. cos EXPR cos Returns the cosine of EXPR (expressed in radians)...
If you are searching for an element in a list, it can be more efficient to store the data in a hash structure, and then simply look to see whether the key is defined, rather than to loop through the entire array using grep() for instance. substr() may be (a lot) faster than ...