How to add values in a dictionary of lists?

General Usage
3

But perhaps you want to push into a Vector in the Dict, for this you first have to create the Vector, because

buffer[value]

isn’t defined in your case.
First check if

buffer[value]

exists:

haskey(buffer,value)

and if not create the Vector first:

v=[ (i,) ]
push!( buffer, value => v )

And if it exists, the push! would be e.g.:

push!( buffer[value], (4,) )
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