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Efficient method to generate UUID String in JAVA (UUID.randomUUID().toString() without the dashes)
...y. There's an API I'm working with (high profile, well known) that doesn't allow dashes in its UUID. You have to strip them.
– Michael Gaines
Oct 28 '15 at 3:28
20
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When is std::weak_ptr useful?
...want to keep them in memory, so you hold a strong pointer to them. Periodically, you scan the cache and decide which objects have not been accessed recently. You don't need to keep those in memory, so you get rid of the strong pointer.
But what if that object is in use and some other code holds a s...
What is the Scala identifier “implicitly”?
...Implicit Views). In this case, the compiler looks for implicit members, locally defined in the current or enclosing scopes, inherited, or imported, that are either Functions from the type of that the.prefix to a type with selection defined, or equivalent implicit methods.
scala> 1.min(2) // Int ...
How do I convert a double into a string in C++?
...
// The C way:
char buffer[32];
snprintf(buffer, sizeof(buffer), "%g", myDoubleVar);
// The C++03 way:
std::ostringstream sstream;
sstream << myDoubleVar;
std::string varAsString = sstream.str();
// The C++11 way:
std::string varAsString = std:...
Correct way to define Python source code encoding
...f you want to be 100% python-docs-recommendation-compatible.
More specifically, you need to use whatever is recognized by Python and the specific editing software you use (if it needs/accepts anything at all). E.g. the coding form is recognized (out of the box) by GNU Emacs but not Vim (yes, withou...
Getting an “ambiguous redirect” error
...
Bash can be pretty obtuse sometimes.
The following commands all return different error messages for basically the same error:
$ echo hello >
bash: syntax error near unexpected token `newline`
$ echo hello > ${NONEXISTENT}
bash: ${NONEXISTENT}: ambiguous redirect
$ echo hello ...
How to determine whether an object has a given property in JavaScript
...
Or even better — Object.prototype.hasOwnProperty.call(x, 'y'), so that property named "hasOwnProperty" would not conflict with inspection process ;)
– kangax
Dec 24 '09 at 14:03
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Easiest way to open a download window without navigating away from the page
...ment will be loaded using the URL as if window.location.assign() had been called with the modified URL” - developer.mozilla.org/en-US/docs/Web/API/window.location
– Rob Juurlink
Aug 19 '13 at 11:47
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How to enter a multi-line command
...me
However, this is only ever necessary in such cases as shown above. Usually you get automatic line continuation when a command cannot syntactically be complete at that point. This includes starting a new pipeline element:
Get-ChildItem |
Select Name,Length
will work without problems since a...
What is difference between Collection.stream().forEach() and Collection.forEach()?
...at with .stream() , I can use chain operations like .filter() or use parallel stream. But what is difference between them if I need to execute small operations (for example, printing the elements of the list)?
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