Watch out for reference duplication instead of instance duplication

# This code will generate 96 instances

ViewStatData = Struct.new(:total, :target, :ratio)

96.times.map {|_|ViewStatData.new(0, 0, 0)}

# And this will not, it'll generate 96 pointers
[ViewStatData.new(0, 0, 0)] * 96
# So Watch out!!!