Can't it at least be something like high := code / 16; low := code % 16; switch high { case 0: template += "40" case 1: template += "44" case 2: t

Can't it at least be something like high := code / 16; low := code % 16; switch high { case 0: template += "40" case 1: template += "44" case 2: template += "42" // ... case 15: template += "43" } switch low { case 0: template += ";30" case 1: template += ";34" // ... case 15: template += ";33" } Or even s := [...]string{"0", "4", "2", ..., "3"} template := "\x1B[4" + s[code / 16] + ";3" + s[code % 16] + "m" (I don't know Go, so you will have to adjust to be valid, and I'm sure there's some sort of string formatting or something that makes the last suggestion more efficient.)