A specialist Set for handling longitude and latitude coordinate arrays. The easiest way to understand the use case for this library is the following code snippet:
const set = new Set();
set.add([32.95, 83.31]);
set.add([32.95, 83.31]);
expect(set.size).toBe(2);This behaves as we would expect for a JavaScript Set - it creates two entries for each Array reference. In simple terms this library allows coordinate Arrays (of type [number, number], where [0] is a valid longitude and [1] is valid latitude, which are often seen in formats like GeoJSON) to be treated as values rather than references, like so:
const set = new CoordinateSet();
set.add([32.95, 83.31]);
set.add([32.95, 83.31]);
expect(set.size).toBe(1);The API matches the original Set API as closely as possible. The library also does basic validation on the input array to make sure it is a valid longitude, latitude pair.
npm install coordinate-setimport { CoordinateSet } from "./src/coordinate-set";
const coordinateSet = new CoordinateSet();
coordinateSet.add([51.509865, -0.118092]); // undefined
coordinateSet.add([51.509865, -0.118092]); // undefined
coordinateSet.has([42.509865, -0.231312]); // false
coordinateSet.add([42.509865, -0.231312]); // undefined
coordinateSet.size; // 2
coordinateSet.delete([51.509865, -0.118092]); // true
coordinateSet.size; // 1
coordinate.clear(); // undefined
coordinateSet.size; // 0
coordinateSet.forEach((value, index, set) => {
// value: [51.509865, -0.118092]
// index: 0
// set: coordinateMap
});
// Spread syntax
const spread = [...coordinateSet];
// for...of
const values = [];
for (let entry of coordinateSet) {
values.push(entry);
}MIT
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