ampersand

On line 60359 of this type definition file , there is the following declaration: type ActivatedEventHandler = (ev: Windows.ApplicationModel.Activation.IActivatedEventArgs & WinRTEvent<any>) => void; What does the & sigil mean in this context? basarat & in a type position means type intersection . More https://www.typescriptlang.org/docs/handbook/advanced-types.html#intersection-types 来源： https://stackoverflow.com/questions/38317625/what-does-the-ampersand-mean-in-a-typescript-type-definition

I want to escape for XSS in an HTML context, and so far I treat the < , > , and " characters. Apparently it is recommended to escape the ampersand as well, but why? (Other than for keeping the HTML valid, let's assume that this is not an issue) So what I am asking is: When I escape < , > and " , can someone demonstrate how the ampersand can still allow an XSS attack in an HTML context? Cheers! You should really take a look at the OWASP XSS Prevention Cheat Sheet. You should escape & because it can be used to circumvent other defenses. Consider this code: <button onclick="confirm('Do you really

i have values with special chars that encoded to ascii in my xml. for example : <?xml version="1.0" encoding="UTF-8"?> <response> <name>Žirmūnų</name> </response> but when i parse value name i get only & as value. Is it allowed to use # or & in xml? or i have to use cdata necessarily? Ivan The & character appears to be illegal, use (below) instead. & Invalid Characters in XML The # character should be OK. Also this may be useful: http://xml.silmaril.ie/specials.html . & needs to be escaped as it is used for esaping itself. All escapes start with & ( " , < , > ). & is the escape for & 来源： https

I know about the ampersand as a bit operation but sometimes I see it in front of variable names. What does putting an & in front of variables do? Icaro It works as an inout to make the variable an in-out parameter. In-out means in fact passing value by reference, not by value. And it requires not only to accept value by reference, by also to pass it by reference, so pass it with & - foo(&myVar) instead of just foo(myVar) As you see you can use that in error handing in Swift where you have to create an error reference and pass it to the function using & the function will populate the error

%let test = one; %let one = two; %put &test; %put &&test; %put &&&test; %put &&&&test; %put &&&&&test; Well. I'm TOTALLY BEATEN by these ampersands. I don't understand why they need SO MANY ampersands before a macro variable. Is there any trick to master the usage of ampersand? BTW, what are the five results, correspondingly? With a single set of ampersands, what you get is pretty boring; after one, odd number of ampersands leads to resolving twice, even number of ampersands resolves once. So you use 1 ampersand to resolve once and 3 ampersands to resolve twice, unless you have stock in the