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Non greedy (reluctant) regex matching in sed?
...uence of digits) Live demo:
$ sed -r 's/([0-9]+).*|./\1/g' <<< 'foo 12 bar 34'
12
How does it work?
This regex benefits from an alternation |. At each position engine tries to pick the longest match (this is a POSIX standard which is followed by couple of other engines as well) which...
How to get the function name from within that function?
...
This might work for you:
function foo() { bar(); }
function bar() { console.log(bar.caller.name); }
running foo() will output "foo" or undefined if you call from an anonymous function.
It works with constructors too, in which case it would output the name...
Writing Unicode text to a text file?
...onvert it to a unicode-encoded string object before writing it to a file:
foo = u'Δ, Й, ק, م, ๗, あ, 叶, 葉, and 말.'
f = open('test', 'w')
f.write(foo.encode('utf8'))
f.close()
When you read that file again, you'll get a unicode-encoded string that you can decode to a unicode objec...
Difference between this and self in self-type annotations?
...class A.
The first two variants
trait A { self: B => ... }
trait A { foo: B => ... }
introduce self (respectively, foo) as an alias for this in trait A. This is useful for accessing the this reference from an inner class. I.e. you could then use self instead of A.this when accessing the t...
What happens if I define a 0-size array in C/C++?
... int content[];
};
The idea is that you would then allocate it so:
void foo(size_t x) {
Array* array = malloc(sizeof(size_t) + x * sizeof(int));
array->size = x;
for (size_t i = 0; i != x; ++i) {
array->content[i] = 0;
}
}
You might also use it statically (gcc extension):
Ar...
Get nested JSON object with GSON using retrofit
..."status":"OK",
"reason":"some reason",
"content" :
{
"foo": 123,
"bar": "some value"
}
}
You'd then have a Content POJO:
class Content
{
public int foo;
public String bar;
}
Then you write a deserializer:
class MyDeserializer implements JsonDeserializer...
How to disable text selection highlighting
...be unselectable. You can set this using an attribute in HTML:
<div id="foo" unselectable="on" class="unselectable">...</div>
Sadly this property isn't inherited, meaning you have to put an attribute in the start tag of every element inside the <div>. If this is a problem, you co...
Best way to test for a variable's existence in PHP; isset() is clearly broken
...ou're actually checking an array element, it makes much more sense: isset($foo[$bar]) becomes array_key_exists($bar, $foo)
– Arild
Aug 25 '14 at 14:12
...
Amazon S3 Change file download name
...to set the downloading filename:
Content-Disposition: attachment; filename=foo.bar
For the sake of fairness I'd like to mention that it was not me to provide the right answer on Amazon forum and all credits should go to Colin Rhodes ;-)
...
Split an NSString to access one particular piece
...
NSArray* foo = [@"10/04/2011" componentsSeparatedByString: @"/"];
NSString* firstBit = [foo objectAtIndex: 0];
Update 7/3/2018:
Now that the question has acquired a Swift tag, I should add the Swift way of doing this. It's pretty ...