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Clean ways to write multiple 'for' loops
.../ ...
}
(or just:
for ( auto& elem: m ) {
}
if you have C++11.)
And if you need the three indexes during such iterations, it's
possible to create an iterator which exposes them:
class Matrix3D
{
// ...
class iterator : private std::vector<int>::iterator
{
Matri...
How to index into a dictionary?
...
Dictionaries are unordered in Python versions up to and including Python 3.6. If you do not care about the order of the entries and want to access the keys or values by index anyway, you can use d.keys()[i] and d.values()[i] or d.items()[i]. (Note that these methods create a...
Set “this” variable easily?
I have a pretty good understanding of Javascript, except that I can't figure out a nice way to set the "this" variable. Consider:
...
Best way to serialize an NSData into a hexadeximal string
...alString];
This is "probably" better than calling [someData description] and then stripping the spaces, <'s, and >'s. Stripping characters just feels too "hacky". Plus you never know if Apple will change the formatting of NSData's -description in the future.
NOTE: I have had people reach ou...
Copy constructor for a class with unique_ptr
... make the class moveable, but not copyable. If you leave out the copy-ctor and copy-assignment, the compiler will guide your way on how to use a std::vector with move-only types.
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improve thi...
get dictionary key by value
...types.FirstOrDefault(x => x.Value == "one").Key;
If values are unique and are inserted less frequently than read, then create an inverse dictionary where values are keys and keys are values.
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Which access modifiers are implied when not specified?
...oncepts that support access modifiers, such as fields, properties, methods and classes, which access modifiers are implied if not specified?
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How can I force a long string without any blank to be wrapped?
...
It's supported only in IE, Safari, and FF3.1 (alpha).
– Adam Bellaire
Jan 31 '09 at 17:21
1
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Incrementing a date in JavaScript
...for #1 was wrong (it added 24 hours, failing to account for transitions to and from daylight saving time; Clever Human pointed out that it would fail with November 7, 2010 in the Eastern timezone). Instead, Jigar's answer is the correct way to do this without a library:
var tomorrow = new Date();
t...
Uncaught SyntaxError: Unexpected token with JSON.parse
... is it not an Array? Why is it an object. Objects start with { and arrays start with [? or am i false here
– user2396641
Sep 4 '16 at 17:20
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