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How do I implement an Objective-C singleton that is compatible with ARC?
...rror. Subverting the fundamentals, and basic contracts, of the language in order to stop others potentially making mistakes seems quite wrong. There's more discussion at boredzo.org/blog/archives/2009-06-17/doing-it-wrong
– occulus
Nov 4 '13 at 16:00
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How to convert string to boolean php
...ordPress shortcode attributes that have values such as true, false, on, 0, etc. Great answer, should definitely be the accepted answer.
– AndyWarren
Jun 8 '17 at 17:49
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When and why to 'return false' in JavaScript?
...lling event.preventDefault() or setting event.returnValue = false (IE); in order to stop the event from bubbling, you'll have to call event.stopPropagation() or setting event.cancelBubble = true (IE)
– Christoph
May 12 '09 at 23:55
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How does delete[] “know” the size of the operand array?
...h to use type information to track the size of non-array heap allocations, etc. Forcing the allocator to store the requested size (so that you wouldn't need to pass the array size yourself) might be a small encumbrance, but it could have performance impacts on conceivable allocator designs.
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How to solve privileges issues when restore PostgreSQL Database
...ose archive elements that are listed in list-file, and restore them in the order they appear in the file. Note that if filtering switches such as -n or -t are used with -L, they will further restrict the items restored.
list-file is normally created by editing the output of a previous -l operat...
How do I uninstall a Windows service if the files do not exist anymore?
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You have at least three options. I have presented them in order of usage preference.
Method 1 - You can use the SC tool (Sc.exe) included in the Resource Kit.
(included with Windows 7/8)
Open a Command Prompt and enter
sc delete <service-name>
Tool help snippet follows:...
How to embed a video into GitHub README.md?
...u downloads from j.gifs.com and requires you to have a gifs.com account in order to download
– Jeroen Wiert Pluimers
Jan 7 '17 at 12:08
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Best way to check for nullable bool in a condition expression (if …)
... x is fine in context and is sometimes cleaner; to wit: var openOrders = orders.Where(x=>x.Open ?? false)
– nothingisnecessary
Oct 24 '19 at 16:25
add a comment
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Return multiple values in JavaScript?
...// literally means { x: x, y: y, z: 'c' };
}
var { z, x, y } = fun1(); // order or full presence is not really important
// literally means var r = fun1(), x = r.x, y = r.y, z = r.z;
console.log(x, y, z);
This syntax can be polyfilled with babel or other js polyfiller for older browsers but fortu...
Oracle: how to UPSERT (update or insert into a table?)
...se uses the undo stack; so Oracle will manage the final state based on the order of when the concurrent transactions started/completed. So, you'll never have a race condition if a constraint check is done before the insert regardless of how many concurrent calls are made to same SQL code. Worst case...