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Count number of rows within each group
...aggregate a variable and do counting too (like 2 functions in aggregation: mean + count)? I need to get the mean of a column and the number of rows for the same value in other column
– sop
May 15 '15 at 14:06
...
Use of 'prototype' vs. 'this' in JavaScript?
...other example is below. It's similar to the first one (and maybe what you meant to ask about):
var A = new function () {
this.x = function () {
//do something
};
};
In this example, the new operator has been added before the function expression so that the function is called as a...
Execute stored procedure with an Output parameter?
...
I think the answer by Jaider below completes this answer since I myself would be interested in the written command and not the mouse solution.
– Alwyn Schoeman
Dec 6 '17 at 2:30
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Difference between a Postback and a Callback
...ming in C (maybe the term existed before that, I don't know) and it simply means a pointer to function and this pointer to a function (name this A) gets passed to another function (name this B) which will later invoke A. Callback is also recently used by Yahoo UI Connection Manager and other Ajax f...
Rollback to an old Git commit in a public repo
...
Well, I guess the question is, what do you mean by 'roll back'? If you can't reset because it's public and you want to keep the commit history intact, do you mean you just want your working copy to reflect a specific commit? Use git checkout and the commit hash.
Edit...
Android Spinner: Get the selected item change event
...
Some of the previous answers are not correct. They work for other widgets and views, but the documentation for the Spinner widget clearly states:
A spinner does not support item click
events. Calling this method will raise
an exception.
Better use OnItemSelectedListener() instead:...
Why is there a `null` value in JavaScript?
... undefined, because the only reason many people have suggested ("undefined means there's no such variable/property") is not valid, at least in JavaScript. undefined can't tell you whether the variable/property exists or not.
console.log(foo); // "ReferenceError: foo is not defined"
...
What's the difference between the data structure Tree and Graph?
...
@user785287 what you mean by centralized map representation?
– Geek
Mar 27 '13 at 15:42
37
...
Android - Back button in the title bar
...ityForResult(myIntent, 0);
return true;
}
That's it!
(In the Android developers API, it recommends messing around with the manifest and adding stuff like android:parentActivityName. But that doesn't seem to work for me. The above is simpler and more reliable.)
<meta-data
android:...
How to disable / enable dialog negative positive buttons?
...builder = new AlertDialog.Builder(MainActivity.this);
builder.setIcon(android.R.drawable.ic_dialog_info);
builder.setTitle("Alert dialog title");
builder.setMessage("This is the example code snippet to disable button if edittext attached to dialog is empty.");
builder.setPositiveButton("PositiveButt...