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Get parts of a NSURL in objective-c
...semicolon)
the query string (that would be if you had GET parameters like ?foo=bar&baz=frob)
the fragment (that would be if you had an anchor in the link, like #foobar).
A "fully-featured" URL would look like this:
http://foobar:nicate@example.com:8080/some/path/file.html;params-here?foo=ba...
Collections.emptyMap() vs new HashMap()
...otations all over the place.
Just compare these two declarations:
Map<Foo, Comparable<? extends Bar>> fooBarMap = new HashMap<Foo, Comparable<? extends Bar>>();
versus:
Map<Foo, Comparable<? extends Bar>> fooBarMap = Collections.emptyMap();
The latter clear...
How does inline Javascript (in HTML) work?
...us depends your definition of "anonymous." Compare with something like var foo = new Function(), where foo.name is an empty string, and foo.toString() will produce something like
function anonymous() {
}
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How to make a variadic macro (variable number of arguments)
...
C99 way, also supported by VC++ compiler.
#define FOO(fmt, ...) printf(fmt, ##__VA_ARGS__)
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“is” operator behaves unexpectedly with integers
...
SENTINEL_SINGLETON = object() # this will only be created one time.
def foo(keyword_argument=None):
if keyword_argument is None:
print('no argument given to foo')
bar()
bar(keyword_argument)
bar('baz')
def bar(keyword_argument=SENTINEL_SINGLETON):
# SENTINEL_SINGLETON...
How can I pass arguments to a batch file?
...ommand /u %arg1% /p %arg2% %*
When you run:
test-command admin password foo bar
the above batch file will run:
fake-command /u admin /p password admin password foo bar
I may have the syntax slightly wrong, but this is the general idea.
...
Remove empty elements from an array in Javascript
...ray
arr = temp;
arr // [1, 2, 3, 3, 4, 4, 5, 6]
Remove empty values
['foo', '',,,'',,null, ' ', 3, true, [], [1], {}, undefined, ()=>{}].filter(String)
// ["foo", null, " ", 3, true, [1], Object {}, undefined, ()=>{}]
...
Scala: Nil vs List()
...n though: if an explicit type is needed for whatever reason I think
List[Foo]()
is nicer than
Nil : List[Foo]
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How to set a Javascript object values dynamically?
...
You can get the property the same way as you set it.
foo = {
bar: "value"
}
You set the value
foo["bar"] = "baz";
To get the value
foo["bar"]
will return "baz".
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What is the C# equivalent to Java's isInstance()?
...esult of the cast and use as if you do. You hardly ever want to write:
if(foo is Bar) {
return (Bar)foo;
}
Instead of:
var bar = foo as Bar;
if(bar != null) {
return bar;
}
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impr...