Higher order cache

hof-cache.ts

function useCache<K, P extends any[], R>(cache: Map<K, R>, fn: (...args: P) => R, getKey: (...args: P) => K) {
    return (...args: P) => {
        const key = getKey(...args)
        const result = cache.get(key)
        if(!!result) return result
        else {
            const newResult = fn(...args)
            cache.set(key, newResult)
            return newResult
        }
    }
}