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When should I use Arrow functions in ECMAScript 6?
...raw(book.currentPage + index, $page);
});
};
We must use function in order for each to bind this dynamically. We can't use an arrow function here.
Dealing with multiple this values can also be confusing, because it's hard to know which this an author was talking about:
function Reader() {
...
What is the purpose of willSet and didSet in Swift?
...stored property.
This is useful for sending notifications, synchronisation etc... (see example below)
Example 5. Concrete Example - ViewController Container
//Underlying instance variable (would ideally be private)
var _childVC : UIViewController? {
willSet {
//REMOVE OLD VC
pr...
Nginx no-www to www and www to no-www
...on / {
rewrite ^/cp/login?$ /cp/login.php last;
# etc etc...
}
}
Note: I have not originally included https:// in my solution since we use loadbalancers and our https:// server is a high-traffic SSL payment server: we do not mix https:// and http://.
To check t...
Calling constructor from other constructor in same class
...
The order of constructor evaluation must also be taken into consideration when chaining constructors:
To borrow from Gishu's answer, a bit (to keep code somewhat similar):
public Test(bool a, int b, string c)
: this(a, b)
{...
Comparing two dictionaries and checking how many (key, value) pairs are equal
... good idea, because the items in a dictionary are not supposed to have any order. You might be comparing [('a',1),('b',1)] with [('b',1), ('a',1)] (same dictionaries, different order).
For example, see this:
>>> x = dict(a=2, b=2,c=3, d=4)
>>> x
{'a': 2, 'c': 3, 'b': 2, 'd': 4}
&...
Tools for JPEG optimization? [closed]
...ic (5-15% with no loss in quality), which is amazing, because it's just re-ordering the progressive scan ordering AFAIK (you might notice the same in other programs, files sometimes get marginally smaller in Photoshop if you choose different number of scans, for no apparent reason). Also, it was mad...
Using the RUN instruction in a Dockerfile with 'source' does not work
...targets /bin/sh to dash for a reason. dash is a fully posix shell which is orders of magnitude faster than bash. linking /bin/sh to bash will drastically reduce your server's performance. cite: wiki.ubuntu.com/DashAsBinSh
– xero
May 9 '16 at 18:35
...
Has anyone actually implemented a Fibonacci-Heap efficiently?
...lemented a Fibonacci-Heap ? I did so a few years back, but it was several orders of magnitude slower than using array-based BinHeaps.
...
String comparison in Python: is vs. == [duplicate]
...or all built-in Python objects (like
strings, lists, dicts, functions,
etc.), if x is y, then x==y is also
True.
Not always. NaN is a counterexample. But usually, identity (is) implies equality (==). The converse is not true: Two distinct objects can have the same value.
Also, is it g...
How do I install cURL on cygwin?
...
In order to use the command-line version of curl, you need the curl executable.
So, run the Cygwins Setup.exe, and select curl (under Net->curl). That one uses libcurl3, which is located in Libs->libcurl3. But libcurl3 wil...