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Days since a U.S. President was last shot
shootings = [
["Abraham Lincoln", new Date(1865, 3, 14), true, true],
["James A. Garfield", new Date(1881, 6, 2), true, true],
["William McKinley", new Date(1901, 8, 6), true, true],
["John F. Kennedy", new Date(1963, 10, 22), true, true],
["Theodore Roosevelt", new Date(1912, 9, 14), false, false],
["Ronald Reagan", new Date(1981, 2, 30), false, true],
["Donald Trump", new Date(2024, 6, 13), false, false]
]
.map(([name, date, killed, inOffice]) => ({ name, date, killed, inOffice }))
.sort((a, b) => d3.ascending(a.date, b.date))
origin = new Date(1789, 3, 30) // April 30, 1789: George Washington became 1st President
daysSinceOrigin = d3.timeDay.count(origin, shootings[0].date)
originalSin = [shootings[0].date, daysSinceOrigin]
// TODO clean this up…
daysSince = [
originalSin,
[shootings[0].date, 0],
...d3.pairs(shootings.map((d) => d.date)).flatMap(([a, b]) => [
[b, d3.timeDay.count(a, b)],
[b, 0]
]),
(date => [date, d3.timeDay.count(shootings.at(-1).date, date)])(new Date())
]
shootingsAnnotated = shootings.map((d) => ({
...d,
daysSince: daysSince.find((e) => +e[0] === +d.date)[1]
}))
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