<<
) and Number.prototype.toString(16)
.String.prototype.padStart(6, '0')
to get a 6-digit hexadecimal value.const RGBToHex = (r, g, b) => ((r << 16) + (g << 8) + b).toString(16).padStart(6, '0');
RGBToHex(255, 165, 1); // 'ffa501'
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