district_winners = district_data
.map(
({
"Paul Vallas": vallas,
'Jesus "Chuy" Garcia': garcia,
"Lori Lightfoot": lightfoot,
"Brandon Johnson": johnson,
district
}) => ({
district,
...Object.entries({ garcia, vallas, lightfoot, johnson }).reduce((a, b) =>
b[1] > a[1] ? b : a
)
})
)
.map((d) => ({
district: d.district,
candidate: d[0],
votes: d[1]
}))
districts = {
blocks.features.map(
(d) =>
(d.properties.district = assignment_hash.get(d.properties.precinct_id)?.[
selected_map
])
);
return blocks;
}
district_borders = turfjs.dissolve(districts, { propertyName: "district" })
fields = Object.fromEntries(
[
"p1_001n",
"school_age_public",
"total_cvap",
"black_cvap",
"white_cvap",
"latino_cvap",
"paul vallas",
"lori e. lightfoot",
"brandon johnson",
'jesus "chuy" garcia'
].map((f) => [f, rollup(f)])
)
district_data = {
const ids = [...Array(20).keys()];
return ids.map((i) => ({
district: i,
popululation: fields.p1_001n.get(i),
"public school students": fields.school_age_public.get(i),
"total CVAP": fields.total_cvap.get(i),
"Black CVAP %": fields.black_cvap.get(i) / fields.total_cvap.get(i),
"Latino CVAP %": fields.latino_cvap.get(i) / fields.total_cvap.get(i),
"white CVAP %": fields.white_cvap.get(i) / fields.total_cvap.get(i),
'Jesus "Chuy" Garcia': fields['jesus "chuy" garcia'].get(i),
"Paul Vallas": fields["paul vallas"].get(i),
"Lori Lightfoot": fields["lori e. lightfoot"].get(i),
"Brandon Johnson": fields["brandon johnson"].get(i)
}));
}
district_data
Type Table, then Shift-Enter. Ctrl-space for more options.
rollup = (property) =>
d3.rollup(
districts.features,
(v) => d3.sum(v, (d) => d.properties[property]),
(d) => d.properties.district
)
blocks_topo = FileAttachment("blocks@9.topojson").json()
choice = (arr) => {
return arr[Math.floor(Math.random() * arr.length)];
}
mapIds = Array.from({ length: 1000 }, (_, i) => i * 10)
selected_map = {
updateButton;
return choice(mapIds);
}
blocks = topojson.feature(blocks_topo, blocks_topo.objects.blocks)
assignments = FileAttachment("assignment@1.csv").csv({ typed: true })
assignment_hash = new Map(assignments.map((d) => [d.block, d]))
may_5_draft_plan_data = FileAttachment("may_5_draft_plan@2.csv").csv({
typed: true
})
may_5_winners = may_5_draft_plan_data
.map(({ district_name, vallas, garcia, lightfoot, johnson }) => ({
district_name,
...Object.entries({ garcia, vallas, lightfoot, johnson }).reduce((a, b) =>
b[1] > a[1] ? b : a
)
}))
.map((d) => ({
district_name: d.district_name,
candidate: d[0],
votes: d[1]
}))
may_5_draft_plan = FileAttachment("may_5_draft_plan@2.geojson").json()
import { rewind } from "@fil/rewind"
turfjs = require("@turf/turf")
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.