seed = +d3.timeDay.floor(new Date())
place = d3.shuffler(d3.randomLcg(seed))(places.slice(0))[0]
places = results.filter(d => d.rating >= 3).sort((a, b) => d3.descending(a.id, b.id))
Math.sqrt(area) / 2
results = {
let results = [];
let n = 0;
while (true) {
const page = await search(category, n);
results = results.concat(page.businesses);
if (results.length >= page.total) break;
if (n++ > 10) break;
}
return results;
}
async function search(category, page = 0) {
const limit = 50;
const params = { limit, offset: page * limit, categories: category };
if (locationType === "City") {
params.location = placeName;
} else {
Object.assign(params, yourLocation);
params.radius = Math.round((Math.sqrt(area) / 2) * 1609); // convert miles to meters
}
return (
await fetch(
`https://cors-proxy.visnup.vercel.app/api.yelp.com/v3/businesses/search?${new URLSearchParams(
params
)}`,
{
headers: { authorization: `Bearer ${yelpKey}` }
}
)
).json();
}
categories = (
await (
await fetch(
`https://cors-proxy.visnup.vercel.app/api.yelp.com/v3/categories`,
{
headers: { authorization: `Bearer ${yelpKey}` }
}
)
).json()
).categories.map((d) => d.alias)
// Docs: https://www.yelp.com/developers/documentation/v3/business_search
yelpKey = "n4MdpSiiFKFAukCljMUheeOWjBXygRXSXGsCyuVqJnhxv3yXwOzPXKXWhClXIenujoNRRDP1nMHFwHUxN6Gm1g872bDyGT3k5UWyDGvSyQawYPz9jXnESXjWLP_kYHYx"
// Docs: https://developers.google.com/maps/documentation/embed/map-generator
gmapsKey = "AIzaSyBz_sOVfuXMJsi5YLkNW0SJv3VqklumDAc"
// Adapted from https://www.johndcook.com/how_big_is_a_degree.html. All lengths in miles. This is only approximate, because it assumes the area is small relative to the surface of the earth, and treats it as rectangular, which it totally isn’t. That sloppiness is of course mine (Toph’s), not John D. Cook’s.
area = {
const { latitude, longitude } = yourLocation;
const unit = 1 / 10 ** precision;
// "A degree of latitude, one degree north or south, is about the same distance anywhere"
const latLength = 69;
// Compute spherical coordinates to find length of one degree of longitude
const earthCircumference = 24902.0;
const longLength =
(Math.cos((latitude * Math.PI) / 180.0) * earthCircumference) / 360.0;
return latLength * longLength * unit ** 2;
}
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
