getting
Returns a provider that resolves to the value of the mapping of the given key. It will have no value if the property has no value, or if it does not contain a mapping for the key.
The returned provider tracks changes to this property and resolves its value dynamically when queried. It also inherits the task dependencies of all entries in the map, if any.
This method is equivalent to
map(m -> m.get(key))
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Return
a Provider for the value
Parameters
key
the key