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Why is char[] preferred over String for passwords?
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A common attack method is to run a process that allocates lots of memory and then scans it for left-over, useful data like passwords. The process doesn't need any magical access to another process's memory space; it just relies on other processes dying without first cleari...
Color in git-log
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From the release notes:
* "git log --format" specifier learned %C(auto) token that tells Git
to use color when interpolating %d (decoration), %h (short commit
object name), etc. for terminal output.)
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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
...nt is closed.
32201
使用已经关联其他操作的Token发出请求。由于包装器的实现，不会发生此错误。
Token already in use.
32202
已发出发送消息的请求，但已达到最大队列中消息数量。
Too many publis...
Why don't structs support inheritance?
...ive on the heap and are referenced via reference pointers, but structs are allocated on the stack (unless they are boxed) or are allocated "inside" the memory occupied by a reference type on the heap.
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PreparedStatement IN clause alternatives?
...from customer c,
in_list v
where c.customer_id=v.token;
return res;
end;
Then you can pass arbitrary number of comma separated customer ids in the parameter, and:
will get no parse delay, as the SQL for select is stable
no pipelined functions complexity - it is just o...
How do I get hour and minutes from NSDate?
...ateComponents:
Obj-C:
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"<your date format goes here"];
NSDate *date = [dateFormatter dateFromString:string1];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calend...
Converting a List to a comma separated string
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Clever but slow and bloated, as it allocates one string per element. Using a StringBuilder would be much more efficient.
– Steven Sudit
Oct 6 '09 at 23:49
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Why is processing a sorted array slower than an unsorted array?
... the unsorted list all tuples are accessed in memory-order. They have been allocated consecutively in RAM. CPUs love accessing memory sequentially because they can speculatively request the next cache line so it will always be present when needed.
When you are sorting the list you put it into rando...
How to make return key on iPhone make keyboard disappear?
...ate after you init the textfield in the .m:
yourTextField = [[UITextField alloc] initWithFrame:yourFrame];
//....
//....
//Setting the textField's properties
//....
//The next line is important!!
yourTextField.delegate = self; //self references the viewcontroller or view your textField is on
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How to convert an int value to string in Go?
...Int will do the job. But Sprintf will use the package reflect, and it will allocate one more object, so it's not an efficient choice.
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