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Any reason why scala does not explicitly support dependent types?
...h dependent types and I think it is possible to express almost all the features of such languages as Epigram or Agda in Scala, but I'm wondering why Scala does not support this more explicitly like it does very nicely in other areas (say, DSLs) ?
Anything I'm missing like "it is not necessary" ?
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Calculate total seconds in PHP DateInterval
What is the best way to calculate the total number of seconds between two dates? So far, I've tried something along the lines of:
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Add a fragment to the URL without causing a redirect?
Is there is a way how to add hash # to my URL without redirect?
3 Answers
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DROP IF EXISTS VS DROP?
... TABLE table_name;
IF EXISTS is not standard; different platforms might support it with different syntax, or not support it at all. In PostgreSQL, the syntax is
DROP TABLE IF EXISTS table_name;
The first one will throw an error if the table doesn't exist, or if other database objects depend on ...
Get lengths of a list in a jinja2 template
How do I get the number of elements in a list in jinja2 template?
3 Answers
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C# generic “where constraint” with “any generic type” definition?
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Option1: Add another parameter to IGarrage representing the T which should be passed into the IGenericCar<T> constraint:
interface IGarrage<TCar,TOther> where TCar : IGenericCar<TOther> { ... }
Option2: Define a base interface for IGenericCar<T> which is not generic an...
Submitting the value of a disabled input field
I want to disable an input field, but when I submit the form it should still pass the value.
4 Answers
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How to use a variable for the key part of a map
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Use this:
def map = [(A):1, (X):2]
For the value-part it's even easier, since there is no automagic "convert text to string" happening:
def map = [keyA:A, keyX:X]
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How to get ER model of database from server with Workbench
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Go to "Database" Menu option
Select the "Reverse Engineer" option.
A wizard will be open and it will generate the ER Diagram for you.
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