Instruction: Explain the concept of Symbols and provide examples of their usage.
Context: This question evaluates the candidate's knowledge of ES6 features and their ability to work with unique identifiers.
Official answer available
Preview the opening of the answer, then unlock the full walkthrough.
To clarify, when you create a Symbol, you can give it a description, which is purely for debugging purposes and has no bearing on the symbol's uniqueness. For instance, let sym1 = Symbol("description") and let sym2 = Symbol("description") will produce two different symbols, despite the identical descriptions. This is a critical point because it underscores the concept of Symbol uniqueness and their role in avoiding property name collisions, especially when working with objects that might be extended or manipulated by third-party code or libraries.
Symbols can be particularly...