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$</lang>
=={{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>
=={{header|Kotlin}}==
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