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HashMap get/put complexity
...e.
In JDK 8, HashMap has been tweaked so that if keys can be compared for ordering, then any densely-populated bucket is implemented as a tree, so that even if there are lots of entries with the same hash code, the complexity is O(log n). That can cause issues if you have a key type where equality ...
How to write to a file in Scala?
...se a helper function:
/**
* Used for reading/writing to database, files, etc.
* Code From the book "Beginning Scala"
* http://www.amazon.com/Beginning-Scala-David-Pollak/dp/1430219890
*/
def using[A <: {def close(): Unit}, B](param: A)(f: A => B): B =
try { f(param) } finally { param.clos...
UI Terminology: Logon vs Login [closed]
... case of an ID, I can use the same ID to access multiple sites, buildings, etc.
Edit 1: I should've added a disclaimer that I have no sources and make no guarantee that these are the official usage of the words. The definitions I'm offering about are based on my personal understanding of the usage,...
Does JavaScript have “Short-circuit” evaluation?
...'s not exactly how the code is evaluated and we'll need to delve deeper in order to fully understand.
How exactly is the && and || interpreted?:
It's time to look "under the hood of the javascript engine". Let's consider this practical example:
function sanitise(x) {
if (isNaN(x)...
Test if a vector contains a given element
...
Maybe I come a little late. which(v, 'b'). Mind the order of the arguments.
– Niklas Mertsch
Dec 19 '18 at 19:40
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How to determine if binary tree is balanced?
...ion cost. You spend a lot of time doing unnecessary tree rearrangements in order to attain a level of balance that in practice makes little difference. Who cares if sometimes it takes forty branches to get to the farthest leaf in a million-node imperfectly-balanced tree when it could in theory take ...
Coding Conventions - Naming Enums
...ng by looking at a name. You can't tell if it's a class, method, property, etc.
– Bassinator
Feb 10 '18 at 17:20
3
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Overflow to left instead of right
... This property is not meant for alignment, and it will change the order of words inside as well. F.e. 14:00–15:00 will turn to 15:00–14:00 in Firefox.
– Andy
Mar 21 '16 at 14:58
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Android Fragments: When to use hide/show or add/remove/replace?
...l go through all of the teardown events in the lifecycle (onPause, onStop, etc) and if for some reason you need that fragment again you would have to insert it back into the container and let it run through all of its initialization again.
If there is a high probability that you will need that fra...
How to change the opacity (alpha, transparency) of an element in a canvas element after it has been
...5 <canvas> element, I would like to load an image file (PNG, JPEG, etc.), draw it to the canvas completely transparently, and then fade it in. I have figured out how to load the image and draw it to the canvas, but I don't know how to change its opacity once it as been drawn.
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