x::AbstractVector
y::AbstractVector
group::AbstractVector
horizontal::Bool = false

using Vega

category = ["A", "A", "A", "A", "B", "B", "B", "B", "C", "C", "C", "C"]
group = [0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3]
value = [0.1, 0.6, 0.9, 0.4, 0.7, 0.2, 1.1, 0.8, 0.6, 0.2, 0.1, 0.7]

gb = groupedbar(x = category, y = value, group = group)
colorscheme!(gb, palette = ("Spectral", 5))