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27 lines
1.2 KiB
JavaScript
27 lines
1.2 KiB
JavaScript
export default{
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functionName:'analyzeGPS',
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prompt:`// Write an async function 'analyzeGPS' that processes GPS data using @turf/turf.
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// - Input: 'readings' array [{ts: number, loc: [lon, lat]}], 'boundary' (GeoJSON Polygon).
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// - You MUST use dynamic import() to load @turf/turf from a CDN.
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// - Filter 'readings' to keep only those where 'loc' is strictly inside 'boundary'.
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// - Sort the valid readings by 'ts' ascending.
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// - Create a LineString from the sorted locations.
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// - Calculate the total length of the path in kilometers using turf.length.
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// - Return the length rounded to 2 decimal places (number). Return 0 if < 2 points.`,
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runTest:async(fn)=>{
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const assert=(c,m)=>{if(!c)throw new Error(m)};
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const poly={type:'Polygon',coordinates:[[[0,0],[0,2],[2,2],[2,0],[0,0]]]};
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const pts=[
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{ts:1,loc:[1,0.5]},
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{ts:3,loc:[1,1.5]}, // Dist from (1,0.5) to (1,1.5) is ~111km
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{ts:2,loc:[3,3]} // Outside
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];
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const res=await fn(pts,poly);
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assert(typeof res==='number','Result should be a number');
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// 1 deg lat is approx 111.32km
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assert(res>110&&res<112,`Expected ~111.32km, got ${res}`);
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const empty=await fn([],poly);
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assert(empty===0,'Should return 0 for empty input');
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}
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};
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