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Common programming mistakes for Clojure developers to avoid [closed]
...urn literals in an anonymous function literal
This works:
user> (defn foo [key val]
{key val})
#'user/foo
user> (foo :a 1)
{:a 1}
so I believed this would also work:
(#({%1 %2}) :a 1)
but it fails with:
java.lang.IllegalArgumentException: Wrong number of args passed to: PersistentA...
How to delete duplicates on a MySQL table?
...
Doesn't seem to work with InnoDB. I ran ALTER TABLE foo ENGINE MyISAM to work around it, changed the engine back after.
– Martin
Jul 17 '13 at 23:06
13
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Inserting a string into a list without getting split into characters
...
To add to the end of the list:
list.append('foo')
To insert at the beginning:
list.insert(0, 'foo')
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MDI CDockablePane使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...[5];//一个CDockablePane的数组
2. CFrameWndEx:: OnCreate() 在Create函数中自动生成了以下代码，对MFC比较熟悉的这里就不讲了：
CMFCPopupMenu::SetForceMenuFocus(FALSE);
InitUserToolbars(NULL, uiFirstUserToolBarId, uiLastUserToolBarId);
EnablePaneMenu(TRUE, ID_VIEW_C...
How to call a parent class function from derived class function?
...uate it by adding the base class's name followed by two colons base_class::foo(...). You should note that unlike Java and C#, C++ does not have a keyword for "the base class" (super or base) since C++ supports multiple inheritance which may lead to ambiguity.
class left {
public:
void foo();
};...
Kotlin: how to pass a function as parameter to another?
Given function foo :
10 Answers
10
...
How to unset a JavaScript variable?
...o-op when the target isn't an object property. e.g.,
(function() {
var foo = 123;
delete foo; // wont do anything, foo is still 123
var bar = { foo: 123 };
delete bar.foo; // foo is gone
}());
But since global variables are actually members of the window object, it works.
When proto...
What use is find_package() if you need to specify CMAKE_MODULE_PATH anyway?
...ocated within your project. Something like this:
CMakeLists.txt
cmake/FindFoo.cmake
cmake/FindBoo.cmake
CMakeLists.txt content:
list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
find_package(Foo REQUIRED) # FOO_INCLUDE_DIR, FOO_LIBRARIES
find_package(Boo REQUIRED) # BOO_INCLUDE_DI...
C# pattern to prevent an event handler hooked twice [duplicate]
...Linq; // Required for the .Contains call below:
...
private EventHandler foo;
public event EventHandler Foo
{
add
{
if (foo == null || !foo.GetInvocationList().Contains(value))
{
foo += value;
}
}
remove
{
foo -= value;
}
}
Usin...
AngularJS : How to watch service variables?
...{
observerCallbacks.push(callback);
};
//call this when you know 'foo' has been changed
var notifyObservers = function(){
angular.forEach(observerCallbacks, function(callback){
callback();
});
};
//example of when you may want to notify observers
this.foo = someNgReso...