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Can someone explain the traverse function in Haskell?
...ld do it in Javascript:
Node.prototype.traverse = function (f) {
return new Node(this.l.traverse(f), f(this.k), this.r.traverse(f));
}
Implementing it like this limits you to the effects that the language allows though. If you f.e. want non-determinism (which the list instance of Applicative mo...
Can we pass parameters to a view in SQL?
...es. For example: a view may combine tables Order and Customer so you get a new "table" of rows from Order along with new columns containing the customer's name and the customer number (combination of tables). Or you might create a view that selects only unprocessed orders from the Order table (stati...
java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
... Log.v("MyFragmentActivity", "onFriendAddedAsyncTask/onPostExecute");
new Handler().post(new Runnable() {
public void run() {
fm = getSupportFragmentManager();
ft = fm.beginTransaction();
ft.remove(dummyFragment);
ft.co...
How to get the data-id attribute?
...).attr("data-id") // will return the string "123"
or .data() (if you use newer jQuery >= 1.4.3)
$(this).data("id") // will return the number 123
and the part after data- must be lowercase, e.g. data-idNum will not work, but data-idnum will.
...
“INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”
...wed by an INSERT internally, which has some unexpected side effects:
A new auto-increment ID is allocated.
Dependent rows with foreign keys may be deleted (if you use cascading foreign keys) or else prevent the REPLACE.
Triggers that fire on DELETE are executed unnecessarily.
Side effects are pr...
I have an error: setOnItemClickListener cannot be used with a spinner, what is wrong?
...s @Alex very well said, you have to use
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
}
@Override
public void onNothingSelec...
How to Customize a Progress Bar In Android
...F = 100;
public static final int DELAY = 30;
private Handler mUpHandler = new Handler();
private Runnable animateUpImage = new Runnable() {
@Override
public void run() {
doTheUpAnimation(fromLevel, toLevel);
}
};
private Handler mDownHandler = new Handler();
private Runnable a...
Map enum in JPA with fixed values?
... {
return nodeType;
}
}
throw new IllegalArgumentException("Unknown database value:" + dbData);
}
}
On the entity you just need:
@Column(name = "node_type_code")
You luck with @Converter(autoApply = true) may vary by container but tested to work ...
Convert string to symbol-able in ruby
... One can even do such outlandish things as :"cat and dog\n on a new line" without the need for to_sym.
– Michael Dorst
Dec 9 '13 at 9:42
3
...
How can I return an empty IEnumerable?
...
Would it change things if he returned, say, new List<Friend>() since it will be cast to IEnumerable<Friend> when returned from that method?
– Sarah Vessels
Jul 12 '10 at 16:57
...