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Understanding what 'type' keyword does in Scala
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Suppose you have the following scenario:
Here you will get compilation error, because eat method in classes Cow and Tiger do not override the eat method in class Animal, because their parameter types are different. It's Grass in class Cow, and Meat in class Tiger vs. Food in class Animal which i...
Reverse engineering from an APK file to a project
...ut why is the name of class, variable are like aa, bc, e.t.c and also many errors
– user2934930
Jan 27 '15 at 7:04
1
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How to drop multiple columns in postgresql
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Does not work for me. I get: ERROR: 42601: syntax error at or near ","
– Audrey
Nov 5 '14 at 12:12
9
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Awaiting multiple Tasks with different results
...stion is whether you want to await them one at a time or all together. The error handling is slightly different - if you use Task.WhenAll, then it will await them all, even if one of them fails early.
– Stephen Cleary
Mar 13 '15 at 12:17
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Mark parameters as NOT nullable in C#/.NET?
...ort around non-nullability I agree. I would also like to see compile-time errors being raised.
– AndrewJacksonZA
Oct 2 '09 at 12:25
2
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Is 0 a decimal literal or an octal literal?
...l literal could be interpreted as a decimal literal. I can see the compile error, now: ERROR: 0 is ambiguous, could be octal zero or could be decimal zero. Consider using (1 - 1) to disambiguate.
– CB Bailey
Aug 1 '11 at 9:25
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Creating the Singleton design pattern in PHP5
...nstance();
$fact == $fact2;
But:
$fact = new UserFactory()
Throws an error.
See http://php.net/manual/en/language.variables.scope.php#language.variables.scope.static to understand static variable scopes and why setting static $inst = null; works.
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Swift - Split string over multiple lines
...te and the +, otherwise you'll get a "'+' is not a postfix unary operator" error
– Orlin Georgiev
Apr 7 '15 at 8:20
Th...
What is the equivalent of Java's final in C#?
...e - failing to assign V or assigning V two or more times will result in an error.
C#'s readonly keyword has no such guarantee - the compiler is more than happy to leave readonly members unassigned or allow you to assign them multiple times within a constructor.
So, final and readonly (at least wit...
Why dict.get(key) instead of dict[key]?
...ever you choose it to be), whereas
dictionary["bogus"]
would raise a KeyError.
If omitted, default_value is None, such that
dictionary.get("bogus") # <-- No default specified -- defaults to None
returns None just like
dictionary.get("bogus", None)
would.
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