The Symbol.for() static method searches for existing symbols in a runtime-wide symbol registry with the given key and returns it if found. Otherwise a new symbol gets created in the global symbol registry with this key.

The toString() method of Symbol values returns a string representing this symbol value.

The Promise.reject() static method returns a Promise object that is rejected with a given reason.

The finally() method of Promise instances schedules a function to be called when the promise is settled (either fulfilled or rejected). It immediately returns an equivalent Promise object, allowing you to chain calls to other promise methods.

The Symbol.split static data property represents the well-known symbol @@split. The String.prototype.split() method looks up this symbol on its first argument for the method that splits a string at the indices that match the current object.

The Symbol.keyFor() static method retrieves a shared symbol key from the global symbol registry for the given symbol.

The Symbol() function returns primitive values of type Symbol.

The Uint32Array() constructor creates Uint32Array objects. The contents are initialized to 0.

# Contributors by commit history https://github.com/mdn/content/commits/main/files/en-us/web/javascript/reference/errors/invalid_for-in_initializer/index.md # Original Wiki contributors fscholz Pat...

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