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The addition (+) operator produces the sum of numeric operands or string concatenation.

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The const declaration declares block-scoped local variables. The value of a constant can't be changed through reassignment using the assignment operator, but if a constant is an object, its properties can be added, updated, or removed.

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Keyboard shortcuts Press ← or → to navigate between chapters Press S or / to search in the book Press ? to show this ...

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JavaScript is a prototype-based language — an object's behaviors are specified by its own properties and its prototype's properties. However, with the addition of classes, the creation of hierarchies of objects and the inheritance of properties and their values are much more in line with other object-oriented languages such as Java. In this section, we will demonstrate how objects can be created from classes.