Declaring Blocks
Blocks use a modified function syntax. Like functions, blocks can take arguments and return values. This is the basic format of a declaration:
<ReturnType>(^<BlockName>)<(Arguments)>
ReturnType is the variable type returned by a block, if any.
BlockName is the symbol used for calling the block. The caret (^) is the system-wide indicator preceding the declaration of a block.
Arguments is an optional ...
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