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List vs List
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So:
void withWilds( List<? extends Map<String,String>> foo ){}
void noWilds( List<Map<String,String>> foo ){}
void main( String[] args ){
List<HashMap<String,String>> myMap;
withWilds( myMap ); // Works
noWilds( myMap ); // Compiler error
}
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How does a public key verify a signature?
I am trying to get a better grapple on how public/private keys work. I understand that a sender may add a digital signature to a document using his/her private key to essentially obtain a hash of the document, but what I do not understand is how the public key can be used to verify that signature.
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Swift make method parameter mutable?
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Swift3 answer for passing mutable array pointer.
Function:
func foo(array: inout Array<Int>) {
array.append(1)
}
Call to function:
var a = Array<Int>()
foo(array:&a)
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Select first row in each GROUP BY group?
As the title suggests, I'd like to select the first row of each set of rows grouped with a GROUP BY .
17 Answers
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Pros and Cons of Interface constants [closed]
...s with global dependencies under the same banner...
If you write MyClass::FOO, you're hard-coded to the implementation details of MyClass. This creates a hard-coupling, which makes your code less flexible, and as such should be avoided. However, interfaces exist to permit exactly this type of cou...
Insert all values of a table into another table in SQL
...the column names rather than selecting "*" though:
INSERT INTO new_table (Foo, Bar, Fizz, Buzz)
SELECT Foo, Bar, Fizz, Buzz
FROM initial_table
-- optionally WHERE ...
I'd better clarify this because for some reason this post is getting a few down-votes.
The INSERT INTO ... SELECT FROM syntax is ...
JavaScript, elegant way to check nested object properties for null/undefined [duplicate]
...;
}, obj);
}
Usage:
get(user, 'loc.lat') // 50
get(user, 'loc.foo.bar') // undefined
Or, to check only if a property exists, without getting its value:
has = function(obj, key) {
return key.split(".").every(function(x) {
if(typeof obj != "object" || obj === null || ! x in...
Kotlin secondary constructor
... for parameters
class C(name: String? = null) {...}
usage:
val c1 = C("foo") // parameter passed explicitly
val c2 = C() // default value used
Note that default values work for any function, not only for constructors
Technique 3. (when you need encapsulation) Use a factory method defined in a...
How can query string parameters be forwarded through a proxy_pass with nginx?
...ss http://service$uri$is_args$args; # proxy pass
}
#http://localhost/test?foo=bar ==> http://service/test?foo=bar&k1=v1&k2=v2
#http://localhost/test/ ==> http://service/test?k1=v1&k2=v2
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Cross-browser window resize event - JavaScript / jQuery
...ead, but if someone doesn't want to use jQuery you can use this:
function foo(){....};
window.onresize=foo;
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