line5.vl

{
    "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
    "data": {
        "url": "https://vega.github.io/vega-lite/data/stocks.csv"
    },
    "description": "Google's stock price over time (quantized as a step-chart).",
    "encoding": {
        "x": {
            "axis": {
                "format": "%Y"
            },
            "field": "date",
            "type": "temporal"
        },
        "y": {
            "field": "price",
            "type": "quantitative"
        }
    },
    "mark": {
        "interpolate": "step-after",
        "type": "line"
    },
    "transform": [
        {
            "filter": "datum.symbol === 'GOOG'"
        }
    ]
}