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What does a lazy val do?
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In contrast to a method (defined with def) a lazy val is executed once and then never again. This can be useful when an operation takes long time to complete and when it is not sure if it is later used.
scala> class X { val x = { Thread.sleep(2000); 15 } }
defined class X
scala> class Y ...
Prompt for user input in PowerShell
I want to prompt the user for a series of inputs, including a password and a filename.
4 Answers
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Flask-SQLAlchemy how to delete all rows in a single table
...ery.delete() as query object as 'BaseQuery' object is not callable. Tested and verified.
– Shirish Kadam
Jul 13 '19 at 23:29
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How to access a mobile's camera from a web app?
In my web app (not native app) for mobiles, I want to take a photo and upload it, but I don't want to use Adobe Flash. Is there any way to do this?
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Is it possible to rename a maven jar-with-dependencies?
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You can specify the finalName property to give the jar the name you want, and specify that appendAssemblyId should be false to avoid the "jar-with-dependencies" suffix.
The configuration below will output a jar called "test.jar"
<plugin>
<artifactId>maven-assembly-plugin</artifac...
Configuration With Same Name Already Exists
...g the drop down list from the grid (not the one at the top of the dialog), and do not check the "Create new solution configurations" checkbox when adding your new project configuration.
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UIView frame, bounds and center
...to add more correct content.
First a recap on the question: frame, bounds and center and theirs relationships.
Frame A view's frame (CGRect) is the position of its rectangle in the superview's coordinate system. By default it starts at the top left.
Bounds A view's bounds (CGRect) expresses a vie...
Close virtual keyboard on button press
I have an Activity with an EditText , a button and a ListView . The purpose is to type a search screen in the EditText , press the button and have the search results populate this list.
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How do you use script variables in psql?
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Postgres variables are created through the \set command, for example ...
\set myvariable value
... and can then be substituted, for example, as ...
SELECT * FROM :myvariable.table1;
... or ...
SELECT * FROM table1 WHERE :myvariable IS NULL;
edit: As of psql 9.1, varia...
Python, add trailing slash to directory string, os independently
...os.path.join(path, '', '') or os.path.join(path_with_a_trailing_slash, '') and you will still only get one trailing slash.
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