The point of the salt is to be unique. The salt is meant to prevent attack cost sharing, i.e. an attacker trying to attack two hashed passwords for less than the twice the cost of attacking one. One solution to ensure uniqueness is to generate a random salt in a wide enough space. Therefore, getting … Read more
You can do this with a lambda: extract_keyname = ->(h) { h[:keyname] } ary_of_hashes.map(&extract_keyname) This tends to be more useful if the block’s logic is more complicated than simply extracting a value from a Hash. Also, attaching names to your bits of logic can help clarify what a chain of Enumerable method calls is trying … Read more
Here’s a module for calculating SHA1 hashes that is usable for Excel formulas eg. ‘=SHA1HASH(“test”)’. To use it, make a new module called ‘module_sha1’ and copy and paste it all in. This is based on some VBA code from http://vb.wikia.com/wiki/SHA-1.bas, with changes to support passing it a string, and executable from formulas in Excel cells. … Read more
You can define an initialize function on your class: class A attr_accessor :b,:c,:d def initialize(h) h.each {|k,v| public_send(“#{k}=”,v)} end end Or you can create a module and then “mix it in” module HashConstructed def initialize(h) h.each {|k,v| public_send(“#{k}=”,v)} end end class Foo include HashConstructed attr_accessor :foo, :bar end Alternatively you can try something like constructor
There’s plenty of hashsum providers in .NET which create cryptographic hashes – which satisifies your condition that they are unique (for most purposes collision-proof). They are all extremely fast and the hashing definitely won’t be the bottleneck in your app unless you’re doing it a trillion times over. Personally I like SHA1: public static string … Read more
You can’t. arrays use the default identity-based Object.hashCode() implementation and there’s no way you can override that. Don’t use Arrays as keys in a HashMap / HashSet! Use a Set of Lists instead.
I suggest that this is the correct behaviour. The 302 and 307 status codes indicate that the resource is to be found elsewhere. #bookmark is a location within the resource. Once the resource (html document) has been located it is for the browser to locate the #bookmark within the document. The analogy is this: You … Read more
You could do it like this: h, h2, h3 = { a: 1 }, { b: 2 }, { c: 3 } a = [h, h2, h3] p Hash[*a.map(&:to_a).flatten] #= > {:a=>1, :b=>2, :c=>3} Edit: This is probably the correct way to do it if you have many hashes: a.inject{|tot, new| tot.merge(new)} # or just … Read more