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How to use classes in JavaScript

In object-oriented programming, the code, methods, attributes, and other information that make up an object can be organized into “classes”, the class construct allows to define prototype-based classes with a clean, versatile, nice-looking syntax.

There are notable hoisting precautions with class declarations – for instance, function declarations are hoisted by default while class declarations are not. Also, all code inside the class construct is automatically in strict mode.

Example implementation:

class Courses {
constructor(remote, onsite) { 
  this.remote = remote; 
  this.onsite = onsite;

“Classes are in fact “special functions”, and just as you can define function expressions and function declarations, the class syntax has two components: class expressions and class declarations.”

Example usage context:

If I am working on a object oriented JavaScript project, I may create object template like classes for my objects that have the same types of properties. Such as with the above example, if I have many objects Courses, I could use prototype-based inheritance to “template” them all to check if each Courses object is either remote or onsite. Doing this with creation of a class provides a clean syntax ready template snippet to run all correlating objects through, a more optimal solution then checking each instance of Courses object’s remote or onsite property over and over again.

“Just like functions, classes can be defined inside another expression, passed around, returned etc.”

“JavaScript classes, introduced in ECMAScript 2015, are primarily syntactical sugar over JavaScript’s existing prototype-based inheritance. The class syntax does not introduce a new object-oriented inheritance model to JavaScript.” –


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Cameron Cashwell Web Developer
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