Inverted index: Difference between revisions

=={{header|Julia}}==

<lang julia>function makedoubleindex(files)

idx = Dict{String, Dict}()

for file in files

str = lowercase(read(file, String))

words = split(str, r"\s+")

for word in words

if !haskey(idx, word)

idx[word] = Dict{String, Int}()

elseif !haskey(idx[word], file)

(idx[word])[file] = 1

else

(idx[word])[file] += 1

end

end

end

idx

end

function wordsearch(dict, words::Vector{String})

for word in words

println("searching for $word")

if haskey(dict, word)

for (f, n) in dict[word]

println("File $f contains $n instances of <$word>.")

end

else

println("No instances of \"$word\" were found.")

end

end

end

wordsearch(dict, word::String) = wordsearch(dict, [word])

const filenames = ["file1.txt", "file2.txt", "file3.txt"]

const didx = makedoubleindex(filenames)

searchterms = ["forehead", "of", "hand", "a", "foot"]

wordsearch(didx, searchterms)

</lang>