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If i use Prime class like this:
Prime.new
I'll get next message:
Prime::new is obsolete. use Prime::instance or class methods of Prime.
I tryied finding this class documentation, but couldn't.
Unfortunately it seems not to be published yet at ruby-doc.org. But you could have a look at the commented source code for now; it includes usage examples.
You should have it locally through ri:
$ ri Prime
= Prime < Object
------------------------------------------------------------------------------
= Includes:
Enumerable (from ruby core)
(from ruby core)
------------------------------------------------------------------------------
The set of all prime numbers.
== Example
Prime.each(100) do |prime|
p prime #=> 2, 3, 5, 7, 11, ...., 97
end
== Retrieving the instance
Prime.new is obsolete. Now Prime has the default instance and you can access
it as Prime.instance.
...
There's also RubyDoc.info which has a better index:
http://rubydoc.info/stdlib/prime/1.9.2/frames
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ruby newbie here.
The Data::Dumper->Dump(object) method in perl is awesome. It logs the entire structure of any object into stdout. Makes it really easy to debug. Basically looking for a method which can print the structure of any object irrespective of its type.
Is there a similar library/method in ruby?
Ruby has two such methods for debugging: p and pp.
The p(x) method is equivalent to:
puts x.inspect
The pp method is similar but pretty. That is it gives a more human-readable output.
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How do I apply a function to all elements of go slice without having to explicitly iterate over the slice?
Is there something similar to Java
stream().map(<fn>) https://docs.oracle.com/javase/8/docs/api/java/util/stream/Stream.html#map-java.util.function.Function-
(OR)
forEach(<fn>) https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html#forEach-java.util.function.Consumer-
Yes, but in a typical Go way, not a typical Java way:
for _, elem := range mySlice {
fn(elem)
}
Go is built on a foundation of simplicity - its lack of features and "sugar" is itself a feature of the language.
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For example I have 4 numbers: 10, 3, 2, 1
Then the question is "How to make 4 numbers above to 24 ?"
The answer is (10-2) * (3 * 1) = (8 * 3) = 24
What is the name of the algorithm in the programming language? to predict the operator (-, +, /, *) in the case above
These fit within the broad class of constraint satisfaction problems - essentially you can easily test a solution, but you need to search to find one. There are several algorithms for dealing with various formulations of constraint satisfaction problems.
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so i had a homework to get a document (a buffer of ASCII bytes) which has the CRC32 hash (the gzip variant of CRC32), of 0xbbd1264f and unti now i don't know how to get it so if someone know how to do that please answer
spoof will calculate what bits out of a provided candidate set to invert in order to force the CRC to the desired value.
From your question, I think you mean generating collision for crc32 with your document.
You can find a lot of articles about creating crc32 collisions. For example you can see it here, here or here.
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I'm looking for a simple to use cross-platform bcrypt library for C. I've searched around a couple places but nothing seems to compares to the ease of use of:
http://bcrypt.codeplex.com/SourceControl/changeset/view/1eef0262901c#BCrypt.Net.Test%2fTestBCrypt.cs
Why are all the C implementations of this a nightmare compared to this .NET lib? Basically 2 functions is what I'm looking for.
1) Generate salt (return a string)
2) Hash string using a given salt & pw (return a string)
Your C options for bcrypt seem to be:
In OpenBSD: https://github.com/openbsd/src/blob/master/lib/libc/crypt/bcrypt.c
In OpenWall: http://openwall.com/crypt/
The C implementations seem to be pretty straightforward to use. The OpenBSD version looks like this:
char *bcrypt(const char *key, const char *salt);
char *bcrypt_gensalt(u_int8_t log_rounds);
P.S. Consider scrypt for new code, if you are not restricted to using bcrypt only due to backward compatibility,