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App Inventor 2 字典代码块 · App Inventor 2 中文网
...将一个值（通常称为键）与另一个值关联的数据结构。
Q：App Inventor 2 什么情况下需要使用字典？
A：列表能完成字典的绝大部分功能，不过字典具有比列表更好的查找性能，因此如果要对数据结构执行大量的操作，建议优先使...
How can one use multi threading in PHP applications
... PHP documentation:
pthreads is an object-orientated API that provides all of the tools needed for multi-threading in PHP. PHP applications can create, read, write, execute and synchronize with Threads, Workers and Threaded objects.
Warning:
The pthreads extension cannot be used in a web ...
How to change the commit author for one specific commit?
...thor of used to be on a branch which was subsequently merged in. More generally, it does not work when handling messy histories.
Since I am apprehensive about running scripts which depend on setting and unsetting environment variables to rewrite git history, I am writing a new answer based on this ...
How to use Namespaces in Swift?
...
like this:
import FrameworkA
import FrameworkB
FrameworkA.foo()
All Swift declarations are considered to be part of
some module, so even when you say "NSLog" (yes, it still exists)
you're getting what Swift thinks of as "Foundation.NSLog".
Also Chris Lattner tweeted about namespacin...
How to enable or disable an anchor using jQuery?
How to enable or disable an anchor using jQuery?
16 Answers
16
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The Difference Between Deprecated, Depreciated and Obsolete [closed]
...s the monetary value of something has decreased over time. E.g., cars typically depreciate in value.
Also for more precise definitions of the terms in the context of the English language I recommend using https://english.stackexchange.com/.
...
How many levels of pointers can we have?
How many pointers ( * ) are allowed in a single variable?
14 Answers
14
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Immutability of Strings in Java
...t, and changing a reference. s2 still points to the same object as we initially set s1 to point to. Setting s1 to "Help!" only changes the reference, while the String object it originally referred to remains unchanged.
If strings were mutable, we could do something like this:
String s1 = "Hello";
St...
TypeError: ObjectId('') is not JSON serializable
My response back from MongoDB after querying an aggregated function on document using Python, It returns valid response and i can print it but can not return it.
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How to serialize an object to XML without getting xmlns=“…”?
... for me to serialize an object in .NET without the XML Namespaces automatically serializing also? It seems that by default .NET believes the XSI and XSD namespaces should be included, but I don't want them there.
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