setExtra(key, extra)
Sets (replaces existing) extra.
Arguments
key
(string): Key to store the extra under (represents given item).extra
(object): Extra data to replace existing one.
Returns
(object): The extra
part of Item - here, the very same that was passed to be set.
(undefined): If item is not found (thus no extra can be added), returns undefined
.
Example
// `extra` will be either an object or undefined - depending if item exists or not
const extra = adapter.setExtra('key', { some: 'data' });
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