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How do I change the value of a global variable inside of a function
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This doesn't work for me: country = 'foo' $.ajax({ url: '/some-endpoint', success: function(data) { country = data.country; } }); console.log(country) // outputs 'foo'
– Mark Simpson
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std::shared_ptr of this
...e_shared_from_this just for this purpose. You inherit from it and you can call .shared_from_this() from inside the class. Also, you are creating circular dependencies here that can lead to resource leaks. That can be resolved with the use of std::weak_ptr. So your code might look like this (assuming...
Creating an instance using the class name and calling constructor
... to use a dollar (as that's what the compiler uses). For example:
package foo;
public class Outer
{
public static class Nested {}
}
To obtain the Class object for that, you'd need Class.forName("foo.Outer$Nested").
s...
Can you use an alias in the WHERE clause in mysql?
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WHERE (sum(reviews.rev_rating)/count(reviews.rev_id))>5
BUT! Not all expressions will be allowed - using an aggregating function like SUM will not work, in which case you'll need to use a HAVING clause.
From the MySQL Manual:
It is not allowable to refer to a
column alias in a WHERE...
Protected methods in Objective-C
...rClassProtectedMethods <NSObject>
- (void) protectMethod:(NSObject *)foo;
@end
@interface SuperClass (ProtectedMethods) < SuperClassProtectedMethods >
@end
SuperClass.m: (compiler will now force you to add protected methods)
#import "SuperClassProtectedMethods.h"
@implementation Supe...
Logical Operators, || or OR?
...
and $e = true || $x = 'foo' will not define $x because of short-circuiting, not because of higher precedence.
– Matt Kieran
Jul 31 '14 at 1:18
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Breaking out of nested loops [duplicate]
... return statement can be used to exit the outermost loop at any time.
def foo():
for x in range(10):
for y in range(10):
print(x*y)
if x*y > 50:
return
foo()
If it's hard to extract that function you could use an inner function, as @bjd2385 s...
How to check whether a string contains a substring in Ruby
...returns the index of the character where the match happens. For example:
"foobar" =~ /bar/ # returns 3
"foobar" =~ /foo/ # returns 0
"foobar" =~ /zzz/ # returns nil
It's important to note that in Ruby only nil and the boolean expression false evaluate to false. Everything else, including an em...
Valid to use (anchor tag) without href attribute?
.... Originally the HTML specification allowed for named anchors (<a name="foo">) and linked anchors (<a href="#foo">).
The named anchor format is less commonly used, as the fragment identifier is now used to specify an [id] attribute (although for backwards compatibility you can still spe...
How to get the unix timestamp in C#
...cNow.ToUnixTimeSeconds()
To get the timestamp from a DateTime:
DateTime foo = DateTime.UtcNow;
long unixTime = ((DateTimeOffset)foo).ToUnixTimeSeconds();
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