It it helps, you can use d3.piecewise, e.g., d3.piecewise(["#fc8d62", "#ffd92f", "#66c2a5", "#8da0cb"]) or if you want to specify the interpolator: d3.piecewise(d3.interpolateLab, ["#fc8d62", "#ffd92f", "#66c2a5", "#8da0cb"]) https://github.com/d3/d3-interpolate/blob/main/README.md#piecewise

Cool! Thanks Mike.