The fat arrow binds at 3 occasions when declaring a method when declaring a function within a method when declaring a function in global context 1. When declaring a method When the Coffeescript compiler encouters the following syntactical pattern within a class declaration class A somemethod: (paramlist) => This will yield the following code within … Read more
this isn’t a jQuery “thing”, but a basic JavaScript one. It can’t be re-written the way you have in examples because it’s an object, in particular either a DOM element or a jQuery object (depending on what context you’re in). So if you did this: $(this + ” div”) What you’d really be doing is … Read more
It is indexer. After you declared it you can do like this: class MyClass { Dictionary<string, MyType> collection; public MyType this[string name] { get { return collection[name]; } set { collection[name] = value; } } } // Getting data from indexer. MyClass myClass = … MyType myType = myClass[“myKey”]; // Setting data with indexer. MyType … Read more
That’s because you aren’t passing a reference to this in the JavaScript function call. this in the JavaScript function doesn’t refer to the same object as in the onClick example. Try this instead: <li onClick=”foo(this)”></li> function foo(item){ alert(item.tagName); }
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.
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
If you want this captured the TypeScript way of doing this is via arrow functions. To quote Anders: The this in arrow functions is lexically scoped Here is the way I like to use this to my advantage: class test{ // Use arrow functions func1=(arg:string)=>{ return arg+” yeah” + this.prop; } func2=(arg:number)=>{ return arg+10 + … Read more
this (in the context of a module) is the same as exports in node.js. However you should generally use exports/module.exports instead, so that it’s explicitly clear what you’re modifying.
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
call is used when you want to control the scope that will be used in the function called. You might want the this keyword to be something else than the scope you assigned the function to, in those cases you can use call or apply to call the function with your own scope. F.ex, it … Read more