it is variable which contains value.
The ‘this’ keyword is used to refer to the object through which the properties or methods were invoked. This use of ‘this’ is a fundamental characteristic of the methods of any class.
What is mean by this keyword in Java?
The this keyword refers to the current object in a method or constructor. The most common use of the this keyword is to eliminate the confusion between class attributes and parameters with the same name (because a class attribute is shadowed by a method or constructor parameter). … Invoke current class constructor.
Answer is “document. write(“Hello World”)”
Why ! Is false?
! evaluates to false because the reference is truthy.  can be converted to an number (0 in this case) which is falsey. Therefore: the condition passes as equal.
What is Webjs?
The in operator returns true if the specified property is in the specified object or its prototype chain.
How do you prevent hoisting?
Some ways to avoid hoisting are:
- Use let or const — As explained above, using let or const instead of var would throw an exception and not let the program run, hence helping catch the issue earlier.
- Use function expressions instead of function declarations.