ColorVariable not working

[MichaelWen_Timmons]

I have a JS API 4x web application that uses a Feature Layer that is populated client-side by data coming from a web socket. I am trying to use the ColorExpression to vary the color on the symbol.

      const colorExpression = `

      var color = $feature.color;

      var code = Decode(color, '#990000', 0, '#006600', 1, '#000000', 2);

      return code;

      `;

      breadcrumbRenderer.visualVariables = [{

        type: "rotation",

        field: "heading",

        rotationType: "geographic"

      },{

        type: "color",

        valueExpression: colorExpression,

        stops: [

          { value: 0, color: "#990000"},          

          { value: 1, color: "#006600"},

          { value: 2, color: "#000000"}

        ]

      }]

The rotation variable works fine but the color variable is ignored, with everything showing up in the default color. If I use something like "0" for valueExpression then it would render in the 0 color, but for some reason my Arcade Expression is not recognized. Can someone help?

[KristianEkenes · Accepted solution]

Your Arcade expression appears to be missing a default value in the Decode function. Add another param, like the number 3, or null so the expression can properly evaluate.

var code = Decode(color, '#990000', 0, '#006600', 1, '#000000', 2, null);