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Can we omit parentheses when creating an object using the “new” operator?
...ng the parenthesis to be omitted if there are no arguments in the function call. Here are some examples using the new operator:
o = new Object; // Optional parenthesis omitted here
d = new Date();
...
Personally, I always use the parenthesis, even when the constructor takes no arguments.
In ad...
std::wstring VS std::string
... Unicode Windows API which I think is fallacious. If your only concern was calling into the Unicode Windows API and not marshalling strings then sure but I don't buy this as the general case.
– John Leidegren
Aug 9 '12 at 18:15
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Error: “dictionary update sequence element #0 has length 1; 2 is required” on Django 1.4
...ut name= on the last argument of the url (or path in Django 2.0+) function call.
For instance, the following functions throw the error from the question:
url(r'^foo/(?P<bar>[A-Za-z]+)/$', views.FooBar.as_view(), 'foo')
path('foo/{slug:bar}/', views.FooBar, 'foo')
But these actually work:
...
构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...表为例；
对于访问数据库客户端来讲，需要根据用户的ID，定位到需要访问的数据；
数据切分算法，
根据用户的ID做hash操作，一致性Hash，这种方式存在失效数据的迁移问题，迁移时间内服务不可用
维护路由表，路由表中存...
How to use the C socket API in C++ on z/OS
...ment product, which provides the relevant header files used to make socket calls.
– Anthony Giorgio
Sep 18 '09 at 11:19
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How far can memory leaks go?
... have covered most aspects of your question w.r.t. modern OSes, but historically, there is one that is worth mentioning if you have ever programmed in the DOS world. Terminant and Stay Resident (TSR) programs would usually return control to the system but would reside in memory which could be revive...
How to do ToString for a possibly null object?
...mat("{0}", myObj);
string.Format will format null as an empty string and call ToString() on non-null objects. As I understand it, this is what you were looking for.
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What does the construct x = x || y mean?
...
It means the title argument is optional. So if you call the method with no arguments it will use a default value of "Error".
It's shorthand for writing:
if (!title) {
title = "Error";
}
This kind of shorthand trick with boolean expressions is common in Perl too. With th...
What is the difference between `let` and `var` in swift?
...ge.” iBooks. https://itunes.apple.com/WebObjects/MZStore.woa/wa/viewBook?id=881256329
EDIT
Because comments asking for adding other facts to the answer, converting this to community wiki answer. Feel free edit the answer to make it better.
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How can I check whether a radio button is selected with JavaScript?
...et's pretend you have HTML like this
<input type="radio" name="gender" id="gender_Male" value="Male" />
<input type="radio" name="gender" id="gender_Female" value="Female" />
For client-side validation, here's some Javascript to check which one is selected:
if(document.getElementById...