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20 lines
606 B
TypeScript
20 lines
606 B
TypeScript
/**
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* Utility function that creates a "city map", which is an object where
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* each city is a key (property).
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*
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* This map uses the official name of the city, NOT its key in the 'Cities' object
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*/
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import { Cities } from "./Cities";
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import { IMap } from "../types";
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export function createCityMap<T>(initValue: T): IMap<T> {
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const map: IMap<T> = {};
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const cities = Object.keys(Cities);
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for (let i = 0; i < cities.length; ++i) {
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map[cities[i]] = initValue;
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}
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// round try JSON so to make sure none of the initial values have the same references.
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return JSON.parse(JSON.stringify(map));
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}
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