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Case insensitive access for generic dictionary
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There's no way to specify a StringComparer at the point where you try to get a value. If you think about it, "foo".GetHashCode() and "FOO".GetHashCode() are totally different so there's no reasonable way you could implement a case-insensitive get on a case-sensitive hash map.
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How to explicitly discard an out argument?
...avoid predeclaring out parameters as well as ignoring them.
public void PrintCoordinates(Point p)
{
p.GetCoordinates(out int x, out int y);
WriteLine($"({x}, {y})");
}
public void PrintXCoordinate(Point p)
{
p.GetCoordinates(out int x, out _); // I only care about x
WriteLine($"{x}...
Get all related Django model objects
How can I get a list of all the model objects that have a ForeignKey pointing to an object? (Something like the delete confirmation page in the Django admin before DELETE CASCADE).
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How to do two-way filtering in AngularJS?
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}
};
});
3. Within the link method, add your custom converters to the ngModel controller
function fromUser(text) {
return (text || '').toUpperCase();
}
function toUser(text) {
return (text || '').toLowerCase();
}
ngModel.$parsers.push(fromUser);
ngModel.$formatters.p...
Database Design for Revisions?
...r(100)') AS LastName,
RevisionXML.value('(/employee/DepartmentId)[1]', 'integer') AS DepartmentId,
FROM EmployeeHistories
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Type erasure techniques
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All type erasure techniques in C++ are done with function pointers (for behaviour) and void* (for data). The "different" methods simply differ in the way they add semantic sugar. Virtual functions, e.g., are just semantic sugar for
struct Class {
struct vtable {
void (*dt...
Java null check why use == instead of .equals()
... a method, if you try to invoke it on a null reference, you'll get a NullPointerException.
For instance:
class Foo {
private int data;
Foo(int d) {
this.data = d;
}
@Override
public boolean equals(Object other) {
if (other == null || other.getClass() != this.g...
How can I change the color of a part of a TextView?
... @Override
public void updateDrawState(TextPaint ds) {
super.updateDrawState(ds);
ds.setUnderlineText(true);
ds.setColor(getResources().getColor(R.color.green));
}
};
ssT...
linq query to return distinct field values from a list of objects
...ue typeIDs.
Is it possible to do write a LINQ query return the 10 unique ints from the list of objs?
7 Answers
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Initial size for the ArrayList
...any elements the list can potentially accommodate without reallocating its internal structures.
When you call new ArrayList<Integer>(10), you are setting the list's initial capacity, not its size. In other words, when constructed in this manner, the array list starts its life empty.
One way...