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Is using 'var' to declare variables optional? [duplicate]
... it's like you're talking about a variable that you have used before.
var foo = 'first time use';
foo = 'second time use';
With regards to scope, it is not true that variables automatically become global. Rather, Javascript will traverse up the scope chain to see if you have used the variable bef...
Why would a static nested interface be used in Java?
...ce code.
Either way, the developer is simply declaring an interface named Foo.Bar. There is no further association with the enclosing class, except that code which cannot access Foo will not be able to access Foo.Bar either. (From source code - bytecode or reflection can access Foo.Bar even if Foo ...
When can I use a forward declaration?
...are a member to be a pointer or a reference to the incomplete type:
class Foo {
X *p;
X &r;
};
Declare functions or methods which accept/return incomplete types:
void f1(X);
X f2();
Define functions or methods which accept/return pointers/references to the incomplete type (but wit...
Closure in Java 7 [closed]
...lation to Java, in the hope to be useful:
//ECMAScript
var f, g;
function foo() {
var x = 0;
f = function() { return ++x; };
g = function() { return --x; };
x = 1;
print('inside foo, call to f(): ' + f()); // "2"
}
foo();
print('call to g(): ' + g()); // "1"
print('call to f(): ' + f())...
What is the difference between 'typedef' and 'using' in C++11?
...C++03) (init. statement in for loop iteration statements).
for(typedef int Foo; Foo{} != 0;) {}
// C++17 (if and switch initialization statements).
if (typedef int Foo; true) { (void)Foo{}; }
// ^^^^^^^^^^^^^^^ init-statement
switch(typedef int Foo; 0) { case 0: (void)Foo{}; }
// ^^^^^^^^^^^^...
SELECT DISTINCT on one column
...RDER BY ID) AS RowNumber
FROM MyTable
WHERE SKU LIKE 'FOO%') AS a
WHERE a.RowNumber = 1
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What techniques can be used to speed up C++ compilation times?
...ample, if you have a class,
template <typename T, typename U>
struct foo { };
and both of T and U can have 10 different options, you have increased the possible template instantiations of this class to 100. One way to resolve this is to abstract the common part of the code to a different clas...
Find when a file was deleted in Git
... Git repository in /home/mark/example/.git/
mark@lunchbox:~/example$ touch foo && git add foo && git commit -m "Added foo"
[master (root-commit) ddff7a7] Added foo
1 file changed, 0 insertions(+), 0 deletions(-)
create mode 100644 foo
mark@lunchbox:~/example$ git checkout -b newbra...
Circular (or cyclic) imports in Python
...
If you do import foo (inside bar.py) and import bar (inside foo.py), it will work fine. By the time anything actually runs, both modules will be fully loaded and will have references to each other.
The problem is when instead you do from foo ...
List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
...-needing method, but sometimes unavoidable.
Example:
import copy
class Foo(object):
def __init__(self, val):
self.val = val
def __repr__(self):
return 'Foo({!r})'.format(self.val)
foo = Foo(1)
a = ['foo', foo]
b = a.copy()
c = a[:]
d = list(a)
e = copy.copy(a)
f = cop...