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Update MongoDB field using value of another field
...or which is an alias for $addFields. I will use $set here as it maps with what we are trying to achieve.
db.collection.<update method>(
{},
[
{"$set": {"name": { "$concat": ["$firstName", " ", "$lastName"]}}}
]
)
MongoDB 3.4+
In 3.4+ you can use $addFields and the $out...
How do I get a reference to the app delegate in Swift?
...naged object context. To resolve this, simply downcast to "AppDelegate" or what ever your UIApplication subclass happens to be called. In Swift 3, 4 & 5, this is done as follows:
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let aVariable = appDelegate.someVariable
...
How to set the focus for a particular field in a Bootstrap modal, once it appears
...
Thank you. I had not seen the "shown" event. Exactly what I was looking for.
– jdkealy
Aug 31 '12 at 16:58
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Set the maximum character length of a UITextField
...range it proposes to replace does exist within its current string. This is what the initial sanity check above does.
swift 3.0 with copy and paste working fine.
func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
let str = (text...
HTTP authentication logout via PHP
What is the correct way to log out of HTTP authentication protected folder?
18 Answers
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How to apply !important using .css()?
...
i am leaning toward your latter approach, but what is sad about it is that ill probably end up having to parse the previous cssText because i cant just discard it
– mkoryak
Apr 16 '10 at 21:13
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How to convert byte array to string [duplicate]
...will vary depending on how the operating system is configured. If you know what encoding the string really is you should use that one instead.
– Wolfgang
Nov 5 '15 at 15:18
3
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Why does Apple recommend to use dispatch_once for implementing the singleton pattern under ARC?
What's the exact reason for using dispatch_once in the shared instance accessor of a singleton under ARC?
2 Answers
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How to reset a form using jQuery with .reset() method
... regular expression: /(^|\.)bs\.(?:.*\.|)fileinput(\.|$)/: Kindly suggest what is issue. Thanks.
– Kamlesh
Sep 25 '19 at 12:22
...
Normal arguments vs. keyword arguments
... concepts, both called "keyword arguments".
On the calling side, which is what other commenters have mentioned, you have the ability to specify some function arguments by name. You have to mention them after all of the arguments without names (positional arguments), and there must be default values...