this refers to your current object. In your case you must have implemented the intent in an inner class ClickEvent, and thats what it points to. Activity.this points to the instance of the Activity you are currently in.
but in typescript this.constructor.prop causes error “TS2339: Property ‘prop’ does not exist on type ‘Function’”. Typescript does not infer the type of constructor to be anything beyond Function (after all … the constructor might be a sub class). So use an assertion: class SomeClass { static prop = 123; method() { (this.constructor as typeof SomeClass).prop; … Read more
Source code is here. exports/require are not keywords, but global variables. Your main script is wrapped before start in a function which has all the globals like require, process etc in its context. Note that while module.js itself is using require(), that’s a different require function, and it is defined in the file called “node.js” … Read more
Because in a method call the this argument is always (in sloppy mode) casted to an object. What you see is a String object, which was produced from the “test” primitive string value. The array on which you call your method is already an object, so nothing happens and you just get the array as … Read more
It’s used to refer to another constructor in the same class. You use it to “inherit” another constructor: public MyClass() {} public MyClass(string something) : this() {} In the above, when the second constructor is invoked, it executes the parameterless constructor first, before executing itself. Note that using : this() is the equivalent of : … Read more
In Javascript, the value of this is dependent on the way you call the function. There are 5 ways to call a function in JS, and they all have effect on this: new Foo(); <= here, you’re creating a new object, and this will reflect that new object Foo(); <= here, you’re calling the function … Read more
As the MDN docs states An arrow function does not have its own this; the this value of the enclosing execution context is used So you would think of onClick={(e) => this.goToStore(e)} as being an anonymous function which can be written as (e) => { return this.goToStore(e) } Now here in this anonymous function this … Read more
this means pointer to the object, so *this is an object. So you are returning an object ie, *this returns a reference to the object.
Passing this to another method/object from inside the constructor can be rather dangerous. Many guarantees that objects usually fulfill are not necessarily true, when they are looked at from inside the constructor. For example if your class has a final (non-static) field, then you can usually depend on it being set to a value and … Read more
Your version is a bit cleaner, but while you’re at it, I would: Avoid leading underscore: _x is ok until somebody chooses _MyField which is a reserved name. An initial underscore followed by a capital letter is not allowed as a variable name. See: What are the rules about using an underscore in a C++ … Read more