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The most sophisticated way for creating comma-separated Strings from a Collection/Array/List?
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Use the Google Guava API's join method:
Joiner.on(",").join(collectionOfStrings);
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Why does ConcurrentHashMap prevent null keys and values?
...oncurrentHashMap himself (Doug Lea):
The main reason that nulls aren't allowed in ConcurrentMaps
(ConcurrentHashMaps, ConcurrentSkipListMaps) is that ambiguities that
may be just barely tolerable in non-concurrent maps can't be
accommodated. The main one is that if map.get(key) returns nul...
Why JavaScript rather than a standard browser virtual machine?
...n the browser rather than requiring the use of a specialized language -- really, a specialized paradigm -- for client scripting only?
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Jelly Bean DatePickerDialog — is there a way to cancel?
...Lollipop, source here. Automated class for use in clients (compatible with all Android versions) updated as well.
TL;DR: 1-2-3 dead easy steps for a global solution:
Download this class.
Implement OnDateSetListener in your activity (or change the class to suit your needs).
Trigger the dialog with...
Mockito: Trying to spy on method is calling the original method
... = new LinkedList();
List spy = spy(list);
// Impossible: real method is called so spy.get(0) throws IndexOutOfBoundsException (the list is yet empty)
when(spy.get(0)).thenReturn("foo");
// You have to use doReturn() for stubbing
doReturn("foo").when(spy).get(0);
In your case it goes something l...
Jquery: how to trigger click event on pressing enter key
...onable from an accessibility perspective. Will this definitely work across all kind of devices having differing "selection" methods?
– Jonny
Oct 17 '19 at 9:10
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Folder structure for a Node.js project
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Concerning the folders you mentioned:
/libs is usually used for custom classes/functions/modules
/vendor or /support contains 3rd party libraries (added as git
sub-module when using git as source control)
/spec contains specifications for BDD tests.
/tests contains the unit-...
Is there a way to do method overloading in TypeScript?
...hod implementation that checks its arguments to decide which overload was called. The signature of the implementation has to be compatible with all of the overloads.
class TestClass {
someMethod(stringParameter: string): void;
someMethod(numberParameter: number, stringParameter: string): vo...
Ruby on Rails: how to render a string as HTML?
...b>Hi</b>"
<%= @str.html_safe %>
Using raw works fine, but all it's doing is converting the string to a string, and then calling html_safe. When I know I have a string, I prefer calling html_safe directly, because it skips an unnecessary step and makes it clearer what's going on. Det...
How to define optional methods in Swift protocol?
...an take advantage of powerful generics system.
You can always be sure that all requirements are met when encountering types that conform to such protocol. It's always either concrete implementation or default one. This is how "interfaces" or "contracts" behave in other languages.
Disadvantages
F...