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a=>a.reduce((p,c)=>p.map((e,i)=>e+c[i])).map(x=>x+7>>3)\$\endgroup\$[[0,200,200],[200,0,200],[200,200,0],[60,200,0],[200,0,200],[0,200,220],[2,200,0],[0,0,7]]yields 83, 125, *104* instead of 83, 125, *103* with your code. \$\endgroup\$ceil. 64 bytes:a=>a.reduce((p,c)=>p.map((e,i)=>e+c[i])).map(x=>(x/8).toFixed())\$\endgroup\$x+4>>3should round correctly. \$\endgroup\$