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When should I use Arrow functions in ECMAScript 6?
...to use the same thisObject as the root. If even a single standard function callback is mixed in with a bunch of arrow functions there's a chance the scope will become messed up.
Compactness: Arrow functions are easier to read and write. (This may seem opinionated so I will give a few examples furthe...
Is Ruby pass by reference or by value?
...o a value of 'foo'?
str = 'foo'
str.object_id # => 2000
A: A label called str is created that points at the object 'foo', which for the state of this Ruby interpreter happens to be at memory location 2000.
Q2: What happens when you assign the existing variable str to a new object using =?...
UIButton Long Press Event
...he press and how much error is tolerable. And also note that the method is called few times if you after recognizing the gesture so if you want to do something at the end of it, you will have to check its state and handle it.
...
ListView inside ScrollView is not scrolling on Android
...roid:nestedScrollingEnabled="true" to its XML declaration or by explicitly calling setNestedScrollingEnabled(true).
If you want to make nested scrolling work on pre-Lollipop devices, which you probably do, you have to use corresponding utility classes from the Support library. First you have to rep...
Preventing Laravel adding multiple records to a pivot table
...$item->id], false);
Update:
Since Laravel 5.3 or 5.2.44, you can also call syncWithoutDetaching:
$cart->items()->syncWithoutDetaching([$item->id]);
Which does exactly the same, but more readable :)
share
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How can I use NSError in my iPhone App?
...ean. I usually put these macro's that I use across the whole app in a file called Constants+Macros.h and import this file in the prefix header (.pch file) so it's available everywhere. If you mean you're only using 1 of the 2 macros, that might work. Perhaps the conversion from int to NSString isn't...
In which case do you use the JPA @JoinTable annotation?
... project_id
name name task_id
The Project_Tasks table is called a "Join Table". To implement this second solution in JPA you need to use the @JoinTable annotation. For example, in order to implement a uni-directional one-to-many association, we can define our entities as such:
Pro...
Get output parameter value in ADO.NET
...) (either explictly or implicitly via a Console.Write() or String.Format() call).
EDIT: Over 3.5 years and almost 20k views and nobody had bothered to mention that it didn't even compile for the reason specified in my "be careful" comment in the original post. Nice. Fixed it based on good comments ...
WebDriver: check if an element exists? [duplicate]
...f you happen to do as I did and look at this and say "What the...? that is calling the same method and therefore will also throw an exception!?!"... look again, its pluralised - 'findElements'. ;)
– Nebu
Apr 28 '16 at 3:25
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How do you query for “is not null” in Mongo?
...
This will return all documents with a key called "IMAGE URL", but they may still have a null value.
db.mycollection.find({"IMAGE URL":{$exists:true}});
This will return all documents with both a key called "IMAGE URL" and a non-null value.
db.mycollection.find({"IMA...