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What does the exclamation mark mean in a Haskell declaration?
...s I try to learn Haskell using a real project to drive it. I don't understand what the exclamation mark in front of each argument means and my books didn't seem to mention it.
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Set time part of DateTime in ruby
Say I have a datetime object eg DateTime.now . I want to set hours and minutes to 0 (midnight). How can I do that?
4 Ans...
Reload django object from database
...@Yunti You can defer fields, or explicitly ask for only a subset of fields and the resulting object will be only partially populated. refresh_from_db will only update such already populated fields.
– 301_Moved_Permanently
Jan 16 '19 at 16:37
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'any' vs 'Object'
I am looking at TypeScript code and noticed that they use:
6 Answers
6
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How to do a join in linq to sql with method syntax?
... special attention to the intermediate object that is created in the Where and Select clauses.
Note that here we also look for any joined objects that have a property1 that matches one of the ones in the input list.
I know this is a bit more complex than what the original asker was looking for, b...
Install autoreconf on OS X v10.7 (Lion)?
... Homebrew, try
brew install automake
Which should also install autoconf and allow rvm to finish installing.
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gdb: how to print the current line or find the current line number?
list commands prints a set of lines, but I need one single line, where I am and where an error has probably occurred.
5 An...
What does “fragment” mean in ANTLR?
...is somewhat akin to an inline function: It makes the grammar more readable and easier to maintain.
A fragment will never be counted as a token, it only serves to simplify a grammar.
Consider:
NUMBER: DIGITS | OCTAL_DIGITS | HEX_DIGITS;
fragment DIGITS: '1'..'9' '0'..'9'*;
fragment OCTAL_DIGITS: '...
What's a concise way to check that environment variables are set in a Unix shell script?
...(an empty string) is OK — not exactly what you want, but the alternative and older notation.
The second variant (using :?) requires DEST to be set and non-empty.
If you supply no message, the shell provides a default message.
The ${var?} construct is portable back to Version 7 UNIX and the Bourne ...
How big should a UIBarButtonItem image be?
I'm looking to create my own custom Sort By Date and Sort By Number buttons that I plan on placing in the navigation bar as the right button.
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