The Symbol.for method allows you to register and look up global symbols by name. The first time it is called with a given key, it creates a new symbol and adds it to the registry.
The next time you call Symbol.for('A'), the same symbol will be returned instead of a new one (in contrast to Symbol('A') which would create a new, unique symbol that happens to have the same description).
a === Symbol.for('A') // true
but
a === Symbol('A') // false
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Symbols:
*
Using Symbol.for to create global shared symbols