sumequals.jl

function sumequals{T}(A::AbstractArray{Int}, d::Dict{T, Int}, v::T)
    n = 0
    @inbounds for x in A
        n += get(d, v, 0) == x
    end
    n
end

A = repeat(1:5, outer=1000)
d = Dict("A"=>1, "B"=>2, "C"=>3)
sumequals(A, d, "C")