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How does deriving work in Haskell?
...n $ (simpleName $ name d, paramsA d, consA d, termsA d)
_ -> error ("derive: not a data type declaration: " ++ show d)
where
consA (DataD _ _ _ cs _) = map conA cs
consA (NewtypeD _ _ _ c _) = [ conA c ]
{- This part no longer works on 7.6.3
p...
How to add a 'or' condition in #ifdef
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answered Mar 6 '19 at 10:05
Minhas KamalMinhas Kamal
10.6k33 gold badges4242 silver badges5454 bronze badges
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Does VBA have Dictionary Structure?
...lic Function Contains(col As Collection, key As Variant) As Boolean
On Error Resume Next
col(key) ' Just try it. If it fails, Err.Number will be nonzero.
Contains = (Err.Number = 0)
Err.Clear
End Function
Edit 24 June 2015: Shorter Contains() thanks to @TWiStErRob.
Edit 25 Septemb...
How to len(generator()) [duplicate]
...FAIU)?
– sschuberth
Feb 7 '17 at 15:05
4
@sschuberth: You are right. If you need both the length ...
How do you disable browser Autocomplete on web form field / input tag?
...d/or password info into inappropriate form fields, causing form validation errors, or worse yet, accidentally inserting usernames into fields that were intentionally left blank by the user.
What's a web developer to do?
If you can keep all password fields on a page by themselves, that's a great s...
How to use “raise” keyword in Python [duplicate]
...poses.
yentup has given the first one.
It's used for raising your own errors.
if something:
raise Exception('My error!')
The second is to reraise the current exception in an exception handler, so that it can be handled further up the call stack.
try:
generate_exception()
except SomeE...
Quicksort vs heapsort
Both quicksort and heapsort do in-place sorting. Which is better? What are the applications and cases in which either is preferred?
...
What is a “surrogate pair” in Java?
I was reading the documentation for StringBuffer , in particular the reverse() method. That documentation mentions something about surrogate pairs . What is a surrogate pair in this context? And what are low and high surrogates?
...
Python Progress Bar
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I tried this code, and it threw a NameError: name 'xrange' is not defined error. Am I missing a module?
– Mushroom Man
May 18 '16 at 1:11
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