bin interval

[mbostock]

This…

• Allows numeric intervals (such as integers) to be specified as the interval option, while avoiding ambiguity with the thresholds option where a number represents the desired number of thresholds.
• When thresholds is specified as an numeric interval (typically indirectly by using the interval option, but also if thresholds is specified explicitly as an interval object), extends the domain to cover the first and last interval automatically. This avoids zero-width bins as seen in When explicit bin thresholds are specified, but no domain is specified, the last bin is dropped #733, and we already do this for temporal data.

Fixes #734. For example, with hourly data:

Plot.plot({
  marks: [
    Plot.rectY(timestamps, Plot.binX({y: "count"}, {x: d => d.timestamp.getUTCHours(), interval: 1}))
  ]
})

[Fil]

👌