@appsemble/utils/objectCache.js

Utility functions used in Appsemble internally

/**
 * Create a function for memoizing values.
 *
 * The cache accepts a factory function which is used for creating a value. If cache is called with
 * the value, the factory is called and the returned value is memoized. If the cache is called with
 * the same value again, the memoized value is returned.
 *
 * @param factory The function that generats new values if necessary.
 * @returns A getter funcion which returns the generated or memoized value.
 */
export function objectCache(factory) {
    const cache = new Map();
    return (id) => {
        if (cache.has(id)) {
            return cache.get(id);
        }
        const item = factory(id);
        cache.set(id, item);
        return item;
    };
}
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