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How to avoid null checking in Java?
...
If null-values are not allowed
If your method is called externally, start with something like this:
public void method(Object object) {
if (object == null) {
throw new IllegalArgumentException("...");
}
Then, in the rest of that method, you'll know that object is not null.
If it i...
Learning Python from Ruby; Differences and Similarities
...r and make 1 off modifications to a Python program. And that's fine for a start to get writing. But try to learn from other projects the why behind the architecture and design decisions rather than the how behind the semantics of the language...
...
Unpacking, extended unpacking and nested extended unpacking
...ms from the corresponding sequence that aren't assigned to variable names. Starting with a fairly simple example:
a, *b, c = "X...Y" # a = 'X', b = ['.','.','.'], c = 'Y'
This becomes
(a, *b, c) = ('X', '.', '.', '.', 'Y')
The simplest way to analyze this is to work from the ...
How to remove/ignore :hover css style on touch devices
...mpatible even with older browsers.
function hasTouch() {
return 'ontouchstart' in document.documentElement
|| navigator.maxTouchPoints > 0
|| navigator.msMaxTouchPoints > 0;
}
if (hasTouch()) { // remove all the :hover stylesheets
try { // prevent exception on browsers ...
What is recursion and when should I use it?
...ough a loop. However, the real problem is in step #1. When many programs start, they allocate a single chunk of memory for their stack, and when they run out of that memory (often, but not always due to recursion), the program crashes due to a stack overflow.
So in these languages recursion is sl...
Pros and cons of AppSettings vs applicationSettings (.NET app.config / Web.config)
...ings> can get rather convoluted and messy, if lots of parts of your app start putting stuff in there (remember the old windows.ini file? :-)).
If you can, I would prefer and recommend using your own configuration sections - with .NET 2.0, it's really become quite easy, That way, you can:
a) D...
What is a Portable Class Library?
... sort of thing.
See Portable Library Tools anouncement blog post, which starts:-
The Portable Library Tools CTP adds a new "Portable Class Library" project template to Visual Studio that can be used to create class libraries in C# and VB that run on the various .NET platforms without recompil...
E731 do not assign a lambda expression, use a def
...ve faced couple of different versions of this.
Now, to keep things DRY, I start to reuse this common lambda.
f = lambda x : x + offset
a = map(f, simple_list)
b = map(f, another_simple_list)
At this point my code quality checker complains about lambda being a named function so I convert it into...
What's the idiomatic syntax for prepending to a short python list?
...from the CPython source where this is implemented - and as you can see, we start at the end of the array and move everything down by one for every insertion:
for (i = n; --i >= where; )
items[i+1] = items[i];
If you want a container/list that's efficient at prepending elements, you want a ...
How do browsers pause/change Javascript when tab or window is not active?
... tabs. It does not matter whether the window is out of focus or not.
Edge
Starting from Edge 14, setInterval is capped at 1000ms in inactive tabs. requestAnimationFrame is always paused in inactive tabs.
Safari
Just like Chrome, Safari caps setInterval at 1000ms when the tab is inactive. requestAn...