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Rediscovering JavaScript: ES6, ES7 & ES8

Class Expressions

Explore how to create dynamic classes using JavaScript class expressions. Understand the differences between class expressions and class statements, learn to build classes at runtime with customizable fields, and see how to instantiate and use these classes effectively.

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Class expressions are useful to create dynamic classes at runtime based on, for example, properties you read from a file, database, or user-provided input. Imagine creating a class factory function that will create and return a class; this is a good place to use a class expression.

Difference between class expression and class statement

JavaScript supports both a class statement, which you use to define a class, and a class expression. The two key differences between a class expression and a class statement are:

  1. The class name is optional for class expressions but required for class statements.

  2. The class expression should be treated as an expression; that is, it ...