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When to use inline function and when not to use it?
...f the library call the old implementation
when developing a library, in order to make a class extensible in the future you should:
add non-inline virtual destructor even if the body is empty
make all constructors non-inline
write non-inline implementations of the copy constructor and assignment...
Does Java 8 provide a good way to repeat a value or function?
...wenting To anyone with experience in FP, code which revolves around higher-order functions is a pure win. To anyone without that experience, it's time to upgrade your skills---or risk being left behind in the dust.
– Marko Topolnik
Aug 30 '13 at 12:14
...
What does “atomic” mean in programming?
...aking the operation atomic consists in using synchronization mechanisms in order to make sure that the operation is seen, from any other thread, as a single, atomic (i.e. not splittable in parts), operation. That means that any other thread, once the operation is made atomic, will either see the val...
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 ...
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 ...
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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git pull from master into the development branch
... command can be done at any point before the merge, i.e., you can swap the order of the fetch and the checkout, because fetch just goes over to the named remote (origin) and says to it: "gimme everything you have that I don't", i.e., all commits on all branches. They get copied to your repository, ...
Why should eval be avoided in Bash, and what should I use instead?
...>&3 2>&1 # Redirect stdout to &3, and stderr to stdout: order matters
command <&3 >&4 # Input and output!
Variable indirection
Scenario:
VAR='1 2 3'
REF=VAR
Bad:
eval "echo \"\$$REF\""
Why? If REF contains a double quote, this will break and open the code...