j2ideas

/*
 <number>         # numeric literal; <number>->TOS
 [xyz a.b.c]      # literal; ->TOS
 TOS @<name>      # apply name; TOS->dict
 <name>           # deref name; dict->TOS
 TOS!<name>       # for x matching <name>: eval(x TOS)
 TOS(xyz a.b.c)   # eval(xyz a.b.c TOS) in context of a lexically-scoped subdict
 TOS<xyz a.b.c>   # eval(xyz a.b.c) in context of TOS's subdictionary
 {xyz a.b.c}      # "flatten" contents of "{}"; recursively unpack literals/deref names.

 Numeric literal can be considered a virtual dictionary entry that evaluates to itself.
 For "!" and "()" eval operations, TOS is popped once and applied repeatedly for each iteration.
 
 snippets:
 [x]@a.b.c [y]@a.b.c     # dict entries stack!
 [xyz]!a.b.*             # eval xyz for each a.b.*
 [xyz]!5                 # eval xyz 5 times (numeric lits not pushed to TOS)

*/