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Android: create a popup that has multiple selection options
...nd option clicked, do this...
}else{
//theres an error in what was selected
Toast.makeText(getApplicationContext(), "Hmmm I messed up. I detected that you clicked on : " + which + "?", Toast.LENGTH_LONG).show();
}
}
});
window.show();
...
filter for complete cases in data.frame using dplyr (case-wise deletion)
...with a list of all variables works, of course. But that is a) verbose when there are a lot of variables and b) impossible when the variable names are not known (e.g. in a function that processes any data.frame).
...
How to specify Composer install path?
...omposer library installer with the "symfony1-plugin" package type. This is what my composer.json file looks like, in order for it to install both Symfony 1.4 (in lib/vendor) and plugins in (/plugins):
{
"config": {
"vendor-dir": "lib/vendor"
},
"repositories": {
"symfony...
to drawRect or not to drawRect (when should one use drawRect/Core Graphics vs subviews/images and wh
... override drawRect, UIKit has to take the slow path because it has no idea what you're doing.
These two problems can be outweighed by benefits in the case of table view cells. After drawRect is called when a view first appears on screen, the contents are cached, and the scrolling is a simple transl...
How can I check if a checkbox is checked?
...
..What if I don't want it to check it for me and I just want to see if it's checked or not?
– Mark Kramer
Feb 17 '17 at 0:18
...
Can I set variables to undefined or pass undefined as an argument?
...hat only exists because in the beginning JavaScript had no exceptions.
what does if (!testvar) actually do? Does it test for undefined and null or just undefined?
Such a ‘truthiness’ test checks against false, undefined, null, 0, NaN and empty strings. But in this case, yes, it is really u...
Using backticks around field names
... compatibility. Backticks/quotes are also necessary because you never know what's going to become a reserved word in future DBMS versions.
– bobince
Nov 4 '08 at 10:55
1
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How to stop C# console applications from closing automatically? [duplicate]
...
@ToolmakerSteve, this is what I am looking for. I know ReadLine() and Read() and wanted to avoid that.
– VivekDev
Jan 24 '16 at 3:24
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SparseArray vs HashMap
...
SparseArray can be used to replace HashMap when the key is a primitive type.
There are some variants for different key/value types, even though not all of them are publicly available.
Benefits are:
Allocation-free
No boxing
Drawbacks:
Generally slower, not indicated...
Change a column type from Date to DateTime during ROR migration
...
When being reversed, how would it know what the old column type it should change back to is?
– Andrew Grimm
Mar 30 '17 at 2:24
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