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String is immutable. What exactly is the meaning? [duplicate]
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Before proceeding further with the fuss of immutability, let's just take a look into the String class and its functionality a little before coming to any conclusion.
This is how String works:
String str = "knowledge";
This, as usual, creates a string containing "knowledge" and assigns it a ...
Swift native base class or NSObject
I tested out some isa swizzling with Swift, and found that it only works when NSObject is a super-class (directly or further up), or by using the '@objc' decoration. Otherwise it will follow a static- and vtable-dispatch style, like C++.
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Splitting a Java String by the pipe symbol using split(“|”)
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Wilfred Hughes
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answered May 29 '12 at 9:10
Jigar JoshiJiga...
Creating a singleton in Python
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class Singleton(type):
_instances = {}
def __call__(cls, *args, **kwargs):
if cls not in cls._instances:
cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
return cls._instances[cls]
class Logger(object):
__metaclass__ = Singleton
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How to elegantly deal with timezones
... the following:
All date times on the server are UTC.
That means using, like you said, DateTime.UtcNow.
Try to trust the client passing dates to the server as little as possible. For example, if you need "now", don't create a date on the client and then pass it to the server. Either create a date ...
C++ Singleton design pattern
...lization/implementation of the Singleton design pattern for C++. It has looked like this (I have adopted it from the real life example):
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“’” showing on page instead of “ ' ”
... answered Mar 19 '10 at 13:06
kennytmkennytm
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How can I use NSError in my iPhone App?
I am working on catching errors in my app, and I am looking into using NSError . I am slightly confused about how to use it, and how to populate it.
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Undo scaffolding in Rails
...migrations generated by the scaffold command, you have to perform a rollback first.
rake db:rollback
You can create scaffolding using:
rails generate scaffold MyFoo
(or similar), and you can destroy/undo it using
rails destroy scaffold MyFoo
That will delete all the files created by gener...
How do you change text to bold in Android?
...e(Typeface.BOLD);
Tv.setTypeface(boldTypeface);
Hope this helps you thank you.
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