Area chart, missing data

The area mark, in blue, shows gaps for missing data—points where the value is NaN, undefined, or Infinite. A second area, in grey, has these data points filtered out altogether, resulting instead in linear interpolation for the gaps.

Plot.plot({
  y: {grid: true, label: "Daily close ($)"},
  marks: [
    Plot.areaY(aapl, {filter: (d) => !isNaN(d.Close), x: "Date", y1: "Close", fill: "#ccc"}),
    Plot.areaY(aapl, {x: "Date", y1: "Close", fill: "steelblue"}),
    Plot.ruleY([0]),
  ]
})

const aapl = FileAttachment("data/AAPL.csv")
  .csv({typed: true})
  .then((aapl) => aapl.map((d) => ({...d, Close: d.Date.getUTCMonth() < 3 ? NaN : d.Close}))) // simulate gaps
  .then(display);