I need to determine if a Perl hash has a given key, but that key will be mapped to an undef value.Specifically, the motivation for this is seeing if boolean flags while using getopt() with a hash refe
In Wintellect\'s PowerC开发者_运维问答ollections, there\'s a GetValueElseAdd which works like this:
I was just going through one of DavidHayden\'s articles on Hashing User Passwords. Really I can\'t get what he is trying to achieve.
I\'d like to create a hashlib instance, update() it, then persist its state in some way. Later, I\'d like to recreate the object using this state data, and continue to update() it. Finally, I\'d like
I have hash (@post) of hashes where I want to keep the order of the hash\'s keys in the array (@post_csv_order) and also want to keep the relationship key => value in the array.
Lua\'s implementation of tables keep its elements in two parts: an array part and a hash part. Does such a thing exist in any other languages?
I need to calculate checksums of quite large files (gigabytes).This can be accomplished using the following method:
Here\'s the desired flow of my PHP app (yes, it\'s vague, but it\'s easier that way): User submits a set of, let\'s say, about 5 objects开发者_如何学运维 by integer IDs. (It\'ll really be more like
I know you can compare the length but many hash types have the same lengths. Is there a way to identify a h开发者_StackOverflow社区ash\'s type and whether it has been salted?
Here\'s a description: It operates like a regular map with get, put, and remove methods, but has a getTopKEntries(int k) method to get the top-K elements, sorted by the key:
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