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What does it mean to “program to an interface”?
... void LandOnThings(){}
}
class Telemarketer inherits Person {
void CallDuringDinner(){}
void ContinueTalkingWhenYouSayNo(){}
}
Clearly, these two objects have nothing in common in terms of direct inheritance. But, you could say they are both annoying.
Let's say our game needs to ha...
Should import statements always be at the top of a module?
...st that's only paid once.
Putting the imports within a function will cause calls to that function to take longer.
So if you care about efficiency, put the imports at the top. Only move them into a function if your profiling shows that would help (you did profile to see where best to improve perfor...
Initialize class fields in constructor or at declaration?
...
Actually it does matter. If the base class constructor calls a virtual method (which is generally a bad idea, but can happen) which is overridden in the derived class, then using instance variable initializers the variable will be initialized when the method is called - whereas u...
What is the formal difference in Scala between braces and parentheses, and when should they be used?
...out this, but I gave up in the end, as the rules are somewhat diffuse. Basically, you’ll have to get the hang of it.
Perhaps it is best to concentrate on where curly braces and parenthesis can be used interchangeably: when passing parameters to method calls. You may replace parenthesis with curly ...
Should a Netflix or Twitter-style web service use REST or SOAP? [closed]
... a server URL I can be accessing remote objects of arbitrary complexity, locally in under five minutes.
Services that return application/xml and application/json are so annoying for client developers. What are we supposed to do with that blob of data?
Fortunately, lots of sites that provide REST s...
Java Constructor Inheritance
...ed constructor to inherit the parameters of a base constructor and automatically forward these to the base constructor so that the derived constructor need not repeat these parameters.
– Derek Mahar
Mar 27 '11 at 15:01
...
How to avoid mysql 'Deadlock found when trying to get lock; try restarting transaction'
...etime <= now() - INTERVAL 900 SECOND
To
DELETE FROM onlineusers
WHERE id IN (
SELECT id FROM onlineusers
WHERE datetime <= now() - INTERVAL 900 SECOND
ORDER BY id
) u;
Another thing to keep in mind is that mysql documentation suggest that in case of a deadlock the client should...
How to catch an Exception from a thread
...st you read more about how threading works, but to quickly summarize: your call to start starts up a different thread, totally unrelated to your main thread. The call to join simply waits for it to be done. An exception that is thrown in a thread and never caught terminates it, which is why join ret...
json.dumps vs flask.jsonify
...sonify() handles lists now. See this commit.
– Jeff Widman
Jan 25 '16 at 19:14
3
But it still doe...
Iterate through options
...
$("#selectId > option").each(function() {
alert(this.text + ' ' + this.value);
});
http://api.jquery.com/each/
http://jsfiddle.net/Rx3AP/
share
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