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When should I use the Visitor Design Pattern? [closed]
...but I've got to admit, I just don't get it. I read the wikipedia article for the pattern and I understand its mechanics but I'm still confused as to when I'd use it.
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What's the difference between lists and tuples?
...tuations where you want to change items within an existing location tuple, for example when iterating through the lines of a page. But tuple immutability forces you to create a new location tuple for each new value. This seems inconvenient on the face of it, but using immutable data like this is a c...
Rails raw SQL example
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side note: records_array will be of different types for different database adapters. If you're using PG, it will be an instance of PG::Result, not Array.
– tybro0103
Jan 14 '14 at 17:28
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Function for Factorial in Python
...lf, you can use an iterative approach:
def factorial(n):
fact = 1
for num in range(2, n + 1):
fact *= num
return fact
or a recursive approach:
def factorial(n):
if n < 2:
return 1
else:
return n * factorial(n-1)
Note that the factorial function is...
.NET / C# - Convert char[] to string
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@Skod: Seeing that it's impossible for a "new" expression to return a value other than an object instance, that should not come as a surprise to anyone.
– Matti Virkkunen
Jan 12 '18 at 16:53
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Generate random password string with requirements in javascript
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Forcing a fixed number of characters is a bad idea. It doesn't improve the quality of the password. Worse, it reduces the number of possible passwords, so that hacking by bruteforcing becomes easier.
To generate a random wor...
What is the difference between “long”, “long long”, “long int”, and “long long int” in C++?
... difference between the two sets, the C++ standard mandates minimum ranges for each, and that long long is at least as wide as long.
The controlling parts of the standard (C++11, but this has been around for a long time) are, for one, 3.9.1 Fundamental types, section 2 (a later section gives simila...
Autoreload of modules in IPython [duplicate]
...here a way to have IPython automatically reload all changed code? Either before each line is executed in the shell or failing that when it is specifically requested to. I'm doing a lot of exploratory programming using IPython and SciPy and it's quite a pain to have to manually reload each module whe...
How do I get the directory that a program is running from?
Is there a platform-agnostic and filesystem-agnostic method to obtain the full path of the directory from where a program is running using C/C++? Not to be confused with the current working directory. (Please don't suggest libraries unless they're standard ones like clib or STL.)
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Backbone.js get and set nested object attribute
...problematic because then you might be tempted to do the same type of thing for set, i.e.
this.model.get("obj1").myAttribute1 = true;
But if you do this, you won't get the benefits of Backbone models for myAttribute1, like change events or validation.
A better solution would be to never nest POJS...