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/**

* @function fibonacciCache

* @description - this is a cached variant of fib number

* @param {number} n - Real number (n > -1)

* @param {Object} cache

* @returns {number}

export const fibonacciCache = (n, cache = null) => {

if (cache) {

const value = cache.get(n)

if (value !== null) {

return value

}

if (n === 1 || n === 2) {

return 1

}

const result = fibonacciCache(n - 1, cache) + fibonacciCache(n - 2, cache)

cache && cache.set(n, result)

return result

}

/**

* @title implementation of union function

* @param {Set} sets

* @return {new Set}

export const union = (...sets) => {

return new Set(sets.reduce((flatArray, set) => [...flatArray, ...set], []))

}