chaining
How does basic object/function chaining work in javascript?
In JavaScript Functions are first class Objects. When you define a function, it is the constructor for that function object. In other words: var gmap = function() { this.add = function() { alert(‘add’); return this; } this.del = function() { alert(‘delete’); return this; } if (this instanceof gmap) { return this.gmap; } else { return … Read more
Optional Chaining Operator in Typescript
At time of writing, TypeScript does not support the optional chaining operator. See discussion on the TypeScript issue tracker: https://github.com/Microsoft/TypeScript/issues/16 As a warning, the semantics of this operator are still very much in flux, which is why TypeScript hasn’t added it yet. Code written today against the Babel plugin may change behavior in the future … Read more
Method Chaining in Java [closed]
Eh. There’s readability arguments to be made in both directions — there’s such a thing as trying to put too much into a single line. But honestly, I suspect here it’s for historical reasons: pervasive “chaining” behavior hadn’t really become popular or well-known when e.g. Swing was being developed. You could argue that it should’ve … Read more
Search on descendants of an element
The advantage of separating the child from the child css selector would only be if you’d like to use the parent for something else. Otherwise, it’s slightly faster to do it in one call, like expect(element(‘#parent_1 > .red’)).toBe(‘red’); since Protractor doesn’t need to make two calls to the browser in this case. Another reason to … Read more
How to select an element’s parent and the parent’s siblings
You want to use addBack() in this case: $(“#test”).siblings(‘p’).addBack().remove(); EDIT Firstly, for future visitors, if you’re using jQuery version 1.8-, you’re probably need to use andSelf() which is the predecessor of addBack() for compatibility issues. Secondly, both end and addBack will do the same task in this case but they’re actually different perspective. Take a … Read more
How to achieve method chaining in Java?
Have your methods return this like: public Dialog setMessage(String message) { //logic to set message return this; } This way, after each call to one of the methods, you’ll get the same object returned so that you can call another method on. This technique is useful when you want to call a series of methods … Read more
Java 8 apply function to all elements of Stream without breaking stream chain
There are (at least) 3 ways. For the sake of example code, I’ve assumed you want to call 2 consumer methods methodA and methodB: A. Use peek(): list.stream().peek(x -> methodA(x)).forEach(x -> methodB(x)); Although the docs say only use it for “debug”, it works (and it’s in production right now) B. Use map() to call methodA, … Read more
Javascript inheritance: call super-constructor or use prototype chain?
The answer to the real question is that you need to do both: Setting the prototype to an instance of the parent initializes the prototype chain (inheritance), this is done only once (since the prototype object is shared). Calling the parent’s constructor initializes the object itself, this is done with every instantiation (you can pass … Read more
C++ execution order in method chaining
Because evaluation order is unspecified. You are seeing nu in main being evaluated to 0 before even meth1 is called. This is the problem with chaining. I advise not doing it. Just make a nice, simple, clear, easy-to-read, easy-to-understand program: int main() { c1 c; int nu = 0; c.meth1(&nu); c.meth2(nu); }