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Should I instantiate instance variables on declaration or in the constructor?
...r the class. The initialization code is inserted into a constructor in the order it appears in the source code, which means that a field initializer can use the initial values of fields declared before it.
Additionally, you might want to lazily initialize your field. In cases when initializing a f...
Best way to find the intersection of multiple sets?
... want here, but in case you ever need a generalisation of "take the sum of all these", "take the product of all these", "take the xor of all these", what you are looking for is the reduce function:
from operator import and_
from functools import reduce
print(reduce(and_, [{1,2,3},{2,3,4},{3,4,5}]))...
rbenv not changing ruby version
...hich Ruby version to use by reading it from the following sources, in this order:
The RBENV_VERSION environment variable, if specified. You can use the rbenv shell command to set this environment variable in your current shell session.
The first .ruby-version file found by searching the director...
Creating a div element in jQuery [duplicate]
...amically generated div, you may need to put single quotes around class, in order for things to work in IE7, and IE8 - for example 'class':'my-class-name'
– klewis
Feb 28 '13 at 23:12
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Detect If Browser Tab Has Focus
... API without a prefix for a while now. I kept Microsoft specific prefix in order to stay compatible with IE10.
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android TextView: setting the background color dynamically doesn't work
...nkey's answer given this is the more popular answer, you MUST set the high order bits to non zero for the transparency. I get caught all the time by specifying the RGB without the A. To set the background to pure blue, use 0xff0000ff, not 0x0000ff or it won't work.
– JohnnyLamb...
Does a finally block always get executed in Java?
...ent, then any finally clauses of those try statements will be executed, in order, innermost to outermost, before control is transferred to the invoker of the method or constructor. Abrupt completion of a finally clause can disrupt the transfer of control initiated by a return statement.
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How to dismiss keyboard for UITextView with return key?
...urn key is pressed, the keyboard for UITextView will disappear. But actually the return key can only act as '\n'.
34 ...
Node.js throws “btoa is not defined” error
...rs (i.e. if you plan to exchange base64 between Node.js and a browser). In order to make it work you have to mark the input text as 'binary'.
Buffer.from('Hélló wórld!!', 'binary').toString('base64')
This gives you SOlsbPMgd/NybGQhIQ==. If you make atob('SOlsbPMgd/NybGQhIQ==') in a browser it...
Java Constructor Inheritance
..., but you still must design your software as a parent-child reltionship in order to support the needs of some framework (whether it's DI or whatever), then that's "distortion"! But I have no idea about how your software is designed.
– Jonathan Feinberg
Oct 29 '...