How to replace multiple values in an large array with the occurrence of the value?

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3

Although, if the keys are “dense” like in your example, you can instead store the countmap in a Vector, which makes it then quite faster to look up:

minkey, maxkey = extrema(keys(blobs_occ))
occ = zeros(Int, maxkey-minkey+1)
for (k, v) in blobs_occ
    occ[k+1-minkey] = v
end
map!(x -> occ[x+1-minkey], blob_counts, blobs)
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