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smap

smap[min, max, op] seq
smap(min, max, op) seq
partition seq into ngrams of size ranging from min to max, then apply op to those ngrams
in the background, we have a variable that keeps track of the current position in the sequence:
the |smap pos>
NB: the indexing for the smap position starts from 1 not 0.

-- just an abstract test:
bracket (*) #=> |[> _ smerge[", "] |__self> _ |]>
print-bracket (*) #=> print bracket |__self>
print-smap-bracket (*) #=> print (the |smap pos> _ |:> __ bracket |__self>)

-- the constant parameter version:
smap[1, 4, print-smap-bracket] ssplit |abcdef>
    1: [a]
    2: [b]
    3: [c]
    4: [d]
    5: [e]
    6: [f]
    2: [a, b]
    3: [b, c]
    4: [c, d]
    5: [d, e]
    6: [e, f]
    3: [a, b, c]
    4: [b, c, d]
    5: [c, d, e]
    6: [d, e, f]
    4: [a, b, c, d]
    5: [b, c, d, e]
    6: [c, d, e, f]

-- the variable parameter version:
-- probably a little slower, but more flexible
smap(|1>, |4>, |op: print-smap-bracket>) ssplit |abcdef>

sequence compound context, context function 3