The Block Begin node is a for-each loop begin node. It takes as inputs
an array to iterate over. The second output is each element of that
array in turn, and the third output is the index of each element in
the array, starting with
0 and going to
The block nodes are usually implicitly put down with the higher level For Loop, For-Each Loop, While Loop tools.
A path to the paired block forming a begin/end block pair. Both nodes must be in the same network. Nodes wired between the pair are enclosed in a convex hull and are placed inside a code block. Depending on the types of the begin and end blocks, different control flow can be done on the block.
Number of Outputs
By default an output is generated for each input. This allows
the specification of extra outputs. If no input wire is present,
the value is assumed to be
0 and the type must be specified.
The outputs of an End block are paired with the outputs of the Begin block. If no names are present, the pairing is done in order. If names are present, they are paired by name.