Character n-grams in array

General Usage
7

This is not what you ask for, but I would still like to showcase the loop fusion and substring features.

julia> ngram(s::AbstractString,n) = [SubString(s,i:i+n-1) for i=1:length(s)-n+1]
ngram (generic function with 1 method)

julia> s = ["apple"
       "orange"
       "pear"
       "honeycrisp apple"
       ];

julia> ngram.(s,2)
4-element Array{Array{SubString{String},1},1}:
 ["ap", "pp", "pl", "le"]
 ["or", "ra", "an", "ng", "ge"]
 ["pe", "ea", "ar"]
 ["ho", "on", "ne", "ey", "yc", "cr", "ri", "is", "sp", "p ", " a", "ap", "pp", "pl", "le"]

julia> ngram.(s,3)
4-element Array{Array{SubString{String},1},1}:
 ["app", "ppl", "ple"]
 ["ora", "ran", "ang", "nge"]
 ["pea", "ear"]
 ["hon", "one", "ney", "eyc", "ycr", "cri", "ris", "isp", "sp ", "p a", " ap", "app", "ppl", "ple"]

And if you really want array of characters:

julia> function split_char(s)
           s= collect.(s)
           end
split_char (generic function with 1 method)

julia> bigrams = ngram.(s,2)
4-element Array{Array{SubString{String},1},1}:
 ["ap", "pp", "pl", "le"]
 ["or", "ra", "an", "ng", "ge"]
 ["pe", "ea", "ar"]
 ["ho", "on", "ne", "ey", "yc", "cr", "ri", "is", "sp", "p ", " a", "ap", "pp", "pl", "le"]

julia> split_char.(bigrams)
4-element Array{Array{Array{Char,1},1},1}:
 [['a', 'p'], ['p', 'p'], ['p', 'l'], ['l', 'e']]
 [['o', 'r'], ['r', 'a'], ['a', 'n'], ['n', 'g'], ['g', 'e']]
 [['p', 'e'], ['e', 'a'], ['a', 'r']]
 [['h', 'o'], ['o', 'n'], ['n', 'e'], ['e', 'y'], ['y', 'c'], ['c', 'r'], ['r', 'i'], ['i', 's'], ['s', 'p'], ['p', ' '], [' ', 'a'], ['a', 'p'], ['p', 'p'], ['p', 'l'], ['l', 'e']]
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