Keywords In Javascript

In the following example extends keyword is used to inherit the properties from the class company to the class model the super method refers to the parent class.

Keywords in javascript. The in operator returns true if the specified property is in the specified object or its prototype chain. These are the words that you cannot use as identifiers variable names function names and loop labels in your javascript programs. In other words every javascript function while executing has a reference to its current execution context called this. What are javascript keywords.

Alone this refers to the global object. Goto double transient volatile int synchronized throws native float short byte boolean long abstract final char. In a method this refers to the owner object. In a function this refers to the global object.

Extends extends keyword is used to create a class inheritance a class created with a class inheritance will inherit all the methods from another class let s discuss it in a nutshell. Well organized and easy to understand web building tutorials with lots of examples of how to use html css javascript sql php python bootstrap java and xml. It has different values depending on where it is used. Let s dive into javascript keywords.

In a function in strict mode this is undefined. The javascript this keyword refers to the object it belongs to. Javascript reserved keywords list 3. Execution context means here is how the function is called.

There are many reserved keywords in javascript programming which has some significant meaning. In an event this refers to the element that received the event. Javascript keywords are reserved words. Javascript has a number of reserved keywords.