Web Reference: Learn what JavaScript Symbols are, why they're unique, and how to use them to create hidden object properties and avoid naming conflicts. Symbol is a built-in object whose constructor returns a symbol primitive — also called a Symbol value or just a Symbol — that's guaranteed to be unique. Symbols are often used to add unique property keys to an object that won't collide with keys any other code might add to the object, and which are hidden from any mechanisms other code will typically use to access the object. That enables a form of weak encapsulation, or a weak form of information hiding. Jun 27, 2022 · Symbols are guaranteed to be unique. Even if we create many symbols with exactly the same description, they are different values. The description is just a label that doesn’t affect anything. For instance, here are two symbols with the same description – they are not equal:
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