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Showing content from https://developers.arcgis.com/javascript/latest/sample-code/visualization-pie-chart/ below:

Pie charts | Sample Code | ArcGIS Maps SDK for JavaScript 4.33

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const layer = new FeatureLayer({
  portalItem: {
    id: "a7c5a8c8ea42416e8bd92df9872cc51b",
  },
  renderer: {
    type: "pie-chart", // autocasts as new PieChartRenderer
    size: 10,
    attributes: [
      {
        color: "#ed5151",
        label: "No high school diploma",
        field: "SOMEHS_CY",
      },
      {
        field: "HSGRAD_CY",
        color: "#149ece",
        label: "High School Diploma",
      },
      {
        field: "CollegeEducated",
        color: "#a7c636",
        label: "College educated",
      },
    ],
    backgroundSymbol: {
      // polygon fill behind pie chart
      color: [127, 127, 127, 0.2],
      outline: {
        width: 1,
        color: [255, 255, 255, 0.3],
      },
    },
    outline: {
      width: 1.5,
      color: "white",
    },
    visualVariables: [
      {
        type: "size", // size visual variable based on population represented in each pie
        valueExpression: "$feature.SOMEHS_CY + $feature.HSGRAD_CY + $feature.CollegeEducated",
        minDataValue: 20000,
        maxDataValue: 500000,
        minSize: 12,
        maxSize: 48,
      },
    ],
  },
});

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