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Getting a slice of keys from a map
...eys, k)
}
}
To be efficient in Go, it's important to minimize memory allocations.
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Try-catch speeding up my code?
...e "ephemeral" -- that is, just pushed and popped on the stack, rather than allocated a specific location on the stack for the duration of the activation. We believe that the JITter will be able to do a better job of register allocation and whatnot if we give it better hints about when locals can be ...
Difference between string and char[] types in C++
...
A char array is just that - an array of characters:
If allocated on the stack (like in your example), it will always occupy eg. 256 bytes no matter how long the text it contains is
If allocated on the heap (using malloc() or new char[]) you're responsible for releasing the memory...
Can an array be top-level JSON-text?
...ed value."
ECMA-404: Any JSON value. "A JSON text is a sequence of tokens formed from Unicode code points that conforms to the JSON value
grammar."
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Adding the little arrow to the right side of a cell in an iPhone TableView Cell
...exPath
Write below code:
if (cell ==nil) {
cell=[[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]autorelease];
//For creating custom accessory view with own image
UIImageView *accessoryView = [[UIImageView alloc] initWithFrame:CGRec...
How do I match any character across multiple lines in a regular expression?
... = "abcde\n fghij<Foobar>"; expression = '(.*)<Foobar>*'; [tokens,matches] = regexp(str,expression,'tokens','match'); (tokens contain a abcde\n fghij item).
Also, in all of boost's regex grammars the dot matches line breaks by default. Boost's ECMAScript grammar allows you to tu...
Asynchronously wait for Task to complete with timeout
...at runtime.
int timeout = 1000;
var task = SomeOperationAsync(cancellationToken);
if (await Task.WhenAny(task, Task.Delay(timeout, cancellationToken)) == task)
{
// Task completed within timeout.
// Consider that the task may have faulted or been canceled.
// We re-await the task so tha...
Is key-value observation (KVO) available in Swift?
...d in Using Key-Value Observing in Swift:
class MyObject {
private var token: NSKeyValueObservation
var objectToObserve = Foo()
init() {
token = objectToObserve.observe(\.bar) { [weak self] object, change in // the `[weak self]` is to avoid strong reference cycle; obviously, i...
Converting NSString to NSDate (and back again)
...String = @"01-02-2010";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd-MM-yyyy"];
NSDate *dateFromString = [dateFormatter dateFromString:dateString];
NSDate convert to NSString:
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[d...
grep exclude multiple strings
...e.txt:
abc
def
ghi
jkl
grep command using -E option with a pipe between tokens in a string:
grep -Ev 'def|jkl' filename.txt
prints:
abc
ghi
Command using -v option with pipe between tokens surrounded by parens:
egrep -v '(def|jkl)' filename.txt
prints:
abc
ghi
...