What is this swift declaration doing?

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According to the author of this page this is declaring a dictionary of dictionaries in swift:

var routeMap : Dictionary<String, Dictionary<String, () -> ()>> = [:]

can you explain what are this doing, specially the part with these hieroglyphs () -> ()>> = [:] at the end?

It appears that the guy is joining a series of commands together. If this is the case, if you can unfold that code into several lines I appreciate.

thanks.

asked 36 secs ago

RubberDuck

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