Visualization of key/value pair fields

[dwhatley19]

Reading 2 has a diagram illustrating the usage of "key/value pair" field types:

The proposed Snapdown syntax for this diagram is:

turtles -> (Map<String,Turtle> (String "Buster") = (Turtle), (String "Buckminster") = (Turtle), (String "Bob") = (Turtle))

Alternatively, one can write:

#1 -> (Turtle)
#2 -> (Turtle)
#3 -> (Turtle)
turtles -> (Map<String,Turtle> (String "Buster") = #1, (String "Buckminster") = #2, (String "Bob") = #3)

[dwhatley19]

Simple cases (e.g. above diagram) are resolved. More complicated cases, as in the diagram in the answer explanation of
http://web.mit.edu/6.031/www/sp20/classes/02-basic-java/#@ex-java_collections-x_marks_the_spot

still need proposed syntax and layout.

[dwhatley19]

Syntax has been revised to:

turtles -> (Map<String,Turtle>
  (String "Buster"): (Turtle),
  (String "Buckminster"): (Turtle)
  (String "Bob"): (Turtle))