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]30:[{"id":"6b1776f5a0a0e76e6428805c0074a8f262e3f34b1b50944da27903e014b409958dc29b03a1c9cc331949d6a2a404c19dfd0d9d36d9c32274e6ffbc07c11350ee","href":"https://static.observableusercontent.com/files/6b1776f5a0a0e76e6428805c0074a8f262e3f34b1b50944da27903e014b409958dc29b03a1c9cc331949d6a2a404c19dfd0d9d36d9c32274e6ffbc07c11350ee","name":"counties-albers-10m.json","type":"application/octet-stream","lastModified":1669905155894.442,"size":795407}] 2d:{"title":"Train tester","cells":[{"id":0,"value":"md`# Train tester`","pinned":false,"hidden":false,"mode":"ojs"},{"id":213,"value":"viewof datafile = Scrubber(datafiles, {\n delay: 10,\n loop: true,\n autoplay: false\n})","pinned":true,"hidden":false,"mode":"ojs"},{"id":29,"value":"map = svg``","pinned":true,"hidden":false,"mode":"ojs"},{"id":179,"value":"getLat = (d) => {\n let loc = projection([+d.longitude, +d.latitude])\n return `${loc && loc[0]}`\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":207,"value":"getLng = (d) => {\n let loc = projection([+d.longitude, +d.latitude])\n return `${loc && loc[1]}`\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":215,"value":"","pinned":false,"hidden":false,"mode":"ojs"},{"id":278,"value":"Grabbing all the data filenames from https://github.com/codecreative/train-tester/tree/main/data\n\n```[...document.querySelectorAll('a[title^=amtrak-2022]')].map( d => d.innerText )```","pinned":false,"hidden":false,"mode":"md"},{"id":256,"value":"$2f","pinned":false,"hidden":false,"mode":"ojs"},{"id":220,"value":"endpoint = `https://raw.githubusercontent.com/codecreative/train-tester/main/data/${datafile}`","pinned":true,"hidden":false,"mode":"ojs"},{"id":288,"value":"mutable data_cache = Object.create({})","pinned":false,"hidden":false,"mode":"ojs"},{"id":116,"value":"data = {\n if( !data_cache[datafile] ) {\n console.log('fetching ', datafile);\n let new_data = await fetch( endpoint )\n .then((response) => response.json())\n .then( json => json.filter( d => d.location ) )\n mutable data_cache[datafile] = new_data;\n return new_data\n } else {\n console.log('from cache', datafile)\n return data_cache[datafile]\n }\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":300,"value":"data_ = fetch( endpoint )\n .then((response) => response.json())\n .then( json => json.filter( d => d.location ) )","pinned":true,"hidden":false,"mode":"ojs"},{"id":37,"value":"projection = d3.geoAlbersUsa().scale(1300).translate([487.5, 305])","pinned":true,"hidden":false,"mode":"ojs"},{"id":47,"value":"path = d3.geoPath()","pinned":true,"hidden":false,"mode":"ojs"},{"id":104,"value":"states = topojson.mesh(us, us.objects.states, (a, b) => a !== b)","pinned":true,"hidden":false,"mode":"ojs"},{"id":108,"value":"nation = topojson.feature(us, us.objects.nation)","pinned":true,"hidden":false,"mode":"ojs"},{"id":101,"value":"counties = topojson.mesh(us, us.objects.counties, (a, b) => a !== b && (a.id / 1000 | 0) === (b.id / 1000 | 0))","pinned":true,"hidden":false,"mode":"ojs"},{"id":13,"value":"us = FileAttachment(\"counties-albers-10m.json\").json()","pinned":true,"hidden":false,"mode":"ojs"},{"id":10,"value":"topojson = require(\"topojson-client@3\")","pinned":true,"hidden":false,"mode":"ojs"},{"id":7,"value":"d3 = require(\"d3-geo@2\")","pinned":true,"hidden":false,"mode":"ojs"},{"id":210,"value":"import { Scrubber } from \"@mbostock/scrubber\"","pinned":true,"hidden":false,"mode":"ojs"}],"files":"$W30","stdlib":"1","titling":"auto"}