If you want an overview of symbols in js, I think ES6 in Depth: Symbols is excellent.
One common use case is to define [Symbol.iterator] or [Symbol.asyncIterator] to create custom iterables. e.g:
[Symbol.iterator]
[Symbol.asyncIterator]
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If you want an overview of symbols in js, I think ES6 in Depth: Symbols is excellent.
One common use case is to define
[Symbol.iterator]or[Symbol.asyncIterator]to create custom iterables. e.g:The Iterators Are Coming! Iterator and asyncIterator in JavaScript
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