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This code works on Codepen: See https://codepen.io/pkshreeman/pen/YQNPKB?editors=0010 However I am trying to use this in my own 'create-react-app' and the error of 'no-restricted-globals' is trigged by event.target.id . What is a workaround for this. How do you get id from 'this' in react other than using the event target? const Elem = (props) =>{ return (<div> <h1 onClick={props.clickon} id="GM"> Good Morning! <br/> {props.name} {props.last} <br /> This is phase three</h1> <button id="btn1" onClick={props.clickon}> {props.text} </button> <button id="btn2" onClick={props.clickon}> Second

I need to know whether, when a class method in C++ is called, the implicit 'this' pointer is the first argument, or the last. i.e: whether it is pushed onto the stack first or last. In other words, I'm asking whether a class method, being called, is taken by the compiler to be: int foo::bar(foo *const this, int arg1, int arg2); //or: int foo::bar(int arg1, int arg2, foo *const this); By extension therefore, and more importantly, that would also answer whether G++ would push the this pointer last or first, respectively. I interrogated google, but I didn't find much. And as a side note, when C++

I was browsing Qt sources, and noticed this QUuid &operator=(const GUID &guid) { *this = QUuid(guid); return *this; } I've never seen assignment to "this" before. What does assignment to "this" do? That is not an assignment to this but to the object pointed by this . That will effectively call operator=( QUuid const & ) on the current object. It just invokes QUuid &operator=(const QUuid& quUid); . 'this' is simply a pointer to the object on which the current method is invoked. Changing the value behind 'this' (by dereferencing the pointer using '*this' and assigning another object) modifies

This question already has answers here : React 'cannot read property of undefined' when using map (2 answers) Closed 2 years ago . This is a follow up to my previous question, but how do I call a function inside React's render() method, if I have a map inside that. Example (this code is inside a class that extends React.Component ): getItemInfo(item){ return `${item.Something} ${item.SomethingElse}` } render() { return ( <div className="someDiv"> { collection.map(function (item) { return <div> {item.Name} {this.getItemInfo(item)} </div> }) } </div> ); } No matter what I try I always end up

StyleCop has a rule about using "this." prefix to calling class members (SA1101). Is this rule holds true about a member (for example a method) of a class which is inherited from its base class. Example: class BaseClass { protected void F1() { ... } } class ChildClass : BaseClass { protected void F2() { ... } protected void F3() { this.F2(); // This is correct acording to SA1101 // F1 is a member of base class and if I dont put this prefix, stylecop will not show any message. this.F1(); // Is this correct? F1(); // Or this? } } I know this is just for better readability. The documentation for

In an example of working with JDBC in Scala, there is a following code: this.synchronized { if (!driverLoaded) loadDriver() } Why this.synchronized instead of just synchronized ? In scala synchronized is not a keyword, as in java. It is in fact a member of AnyRef , which is scala equivalent for java's Object . So to answer your question, you can either use synchronized or this.synchronized , just as you can do toString or this.toString . 来源： https://stackoverflow.com/questions/7826822/why-this-synchronized-instead-of-just-synchronized-in-scala