03_flow_data_loops.md
In flow: View and Browse Code Using Flow Diagrams

flow_data works with an empty for loop

Code
  out
Output
  $nodes
    id block_type                  code_str label
  1  0     header                    fun(x)      
  2  1        for   for (x in foo)  \n           
  3  2   standard                                
  4 -1      start                                
  5  3     return

  $edges
    from to edge_label arrow
  1    0  1               ->
  2    1  2               ->
  3    2 -1               ->
  4    1 -1       next    <-
  5   -1  3               ->

flow_data works with simple for loop

Code
  out
Output
  $nodes
    id block_type                  code_str label
  1  0     header                    fun(x)      
  2  1        for   for (x in foo)  \n           
  3  2   standard                         x      
  4 -1      start                                
  5  3     return

  $edges
    from to edge_label arrow
  1    0  1               ->
  2    1  2               ->
  3    2 -1               ->
  4    1 -1       next    <-
  5   -1  3               ->

flow_data works with simple while loop

Code
  out
Output
  $nodes
    id block_type               code_str label
  1  0     header                 fun(x)      
  2  1      while   while (foo)  \n           
  3  2   standard                      x      
  4 -1      start                             
  5  3     return

  $edges
    from to edge_label arrow
  1    0  1               ->
  2    1  2               ->
  3    2 -1               ->
  4    1 -1       next    <-
  5   -1  3               ->

flow_data works with simple repeat loop

Code
  out
Output
  $nodes
    id block_type code_str label
  1  0     header   fun(x)      
  2  1     repeat   repeat      
  3  2   standard        x      
  4 -1      start               
  5  3     return

  $edges
    from to edge_label arrow
  1    0  1               ->
  2    1  2               ->
  3    2 -1               ->
  4    1 -1       next    <-
  5   -1  3               ->

flow_data works if else call with for loops on each side

Code
  out
Output
  $nodes
     id block_type                  code_str label
  1   0     header                    fun(x)      
  2   1         if         if (foo)  \n           
  3   2        for   for (x in bar)  \n           
  4   3   standard                       baz      
  5  -2      start                                
  6   4        for   for (x in qux)  \n           
  7   5   standard                      quux      
  8  -4      start                                
  9  -1        end                                
  10  6     return

  $edges
     from to edge_label arrow
  1     0  1               ->
  2     1  2          y    ->
  3     2  3               ->
  4     3 -2               ->
  5     2 -2       next    <-
  6    -2 -1               ->
  7     1  4          n    ->
  8     4  5               ->
  9     5 -4               ->
  10    4 -4       next    <-
  11   -4 -1               ->
  12   -1  6               ->