Change color based on graph value about billboard.js HOT 2 CLOSED

color: function(color, d) {
        // define your color scale
	var colorRange = d3.scaleLinear()
		.domain([0, 20])
		.range(["white", "orange", "red"]);

	if (typeof d === "object") {
		// for data point
		if (d.value) {
			return colorRange(d.value);
	
	    	// for data type (ex. line, bar)
	    	} else {
			return color;
	    	}
	
	// for label
	} else {
	    return color;
	}
}