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flatmap
Combined from primary sources listed below.

In List§

See primary documentation in context for method flatmap 

method flatmap(List:D: &code --> Seq:D)

Convenience method, analogous to .map(&block).flat.

In Any§

See primary documentation in context for method flatmap 

method flatmap(&block, :$label)

Convenience method, analogous to .map(&block).flat.