Published
Edited
Nov 11, 2020
4 stars
CBPDetentionsFiltered = CBPDetentionsGroupedByDay.filter(
d => d.timestamp_in >= timeRange[0] && d.timestamp_in <= timeRange[1]
)
// Intermediate data structure that counts subgroups by day;
// this is slow to calculate but greatly speeds up subsequent
// calculations.
CBPDetentionsGroupedByDay = d3
.rollups(
CBPDetentions,
day => ({
hours_in_custody: d3.sum(day, d => Math.round(d.hours_in_custody)),
gender: d3.rollups(day, group => group.length, d => d.gender),
age_group: d3.rollups(day, group => group.length, d => d.age_group),
citizenship: d3.rollups(day, group => group.length, d => d.citizenship)
}),
d =>
moment(d.date_in)
.startOf('day')
.toString()
)
.map(([date, data]) => ({
...data,
timestamp_in: new moment(date).unix() * 1000
}))
.sort((a, b) => a.timestamp_in - b.timestamp_in)
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