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Is it safe to ignore the possibility of SHA collisions in practice?
... If you don't check for the possibility of an uncorrected error on every fetch from memory or read from disk (which have a far higher probability than an SHA-256 collision), you may not fully understand probabilities.
– Christophe
Oct 24 '15 at 18:46
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Difference between __str__ and __repr__?
...implementing a date/time abstraction, the str can be "2010/4/12 15:35:22", etc. The goal is to represent it in a way that a user, not a programmer, would want to read it. Chop off useless digits, pretend to be some other class — as long is it supports readability, it is an improvement.
Container...
How to overload functions in javascript?
...tion(first,second,third){ /* what we will do if 3 args passed? */});
//... etc :)
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Why is it bad style to `rescue Exception => e` in Ruby?
... - because the airbag didn't inflate, you're probably hurt (getting fired, etc).
But wait! There's more reasons why you might want to use rescue Exception => e!
Let's say you're that car, and you want to make sure the airbag inflates if the car is exceeding its safe stopping momentum.
begin
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How to write the Fibonacci Sequence?
...ers of the
sequence itself, yielding the sequence
0, 1, 1, 2, 3, 5, 8, etc.
If your language supports iterators you may do something like:
def F():
a,b = 0,1
while True:
yield a
a, b = b, a + b
Display startNumber to endNumber only from Fib sequence.
Once you know h...
Mimicking sets in JavaScript?
...sion (e.g. toString() operator).
// This includes strings, numbers, dates, etc...
// It does not include objects or arrays though
// one could implement a toString() operator
// on an object that would uniquely identify
// the object.
//
// Uses a javascript object to hold the Set
//
// Th...
Javascript web app and Java server, build all in Maven or use Grunt for web app?
...sing Bower for Dependency Management and Grunt for building, running tests etc. ( Yeoman )
5 Answers
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Singleton: How should it be used
...rything depends on your Singleton, it's harder to change it, split to two, etc. You're generally stuck with it. This also hampers flexibility. Investigate some Dependency Injection framework to try to alleviate this issue.
s...
Why does casting int to invalid enum value NOT throw exception?
...o created .NET. An enum is backed by another value type (int, short, byte, etc), and so it can actually have any value that is valid for those value types.
I personally am not a fan of the way this works, so I made a series of utility methods:
/// <summary>
/// Utility methods for enum value...
Spring MVC: How to perform validation?
... business validation logic, conditional validation across multiple fields, etc.), or for some reason you cannot use method 1, use manual validation. It is a good practice to separate the controller’s code from the validation logic. Don't create your validation class(es) from scratch, Spring provid...