Use el constructor para clonar mapas y conjuntos:
var clonedMap = new Map(originalMap) var clonedSet = new Set(originalSet)Crear un nuevo conjunto a través de un bucle for es más rápido que el constructor de conjuntos. Lo mismo ocurre con Maps, aunque en menor grado.
const timeInLoop = (desc, loopCount, fn) => { const d = `${desc}: ${loopCount.toExponential()}` console.time(d) for (let i = 0; i < loopCount; i++) { fn() } console.timeEnd(d) } const set = new Set([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) const setFromForLoop = x => { const y = new Set() for (const item of x) y.add(item) return y } const map = new Map([['a', 1], ['b', 2], ['c', 3], ['d', 4], ['e', 5]]) const mapFromForLoop = x => { const y = new Map() for (const entry of x) y.set(...entry) return y } timeInLoop('new Set(set)', 1e5, () => new Set(set)) timeInLoop('setFromForLoop(set)', 1e5, () => setFromForLoop(set)) timeInLoop('new Map(map)', 1e5, () => new Map(map)) timeInLoop('mapFromForLoop(map)', 1e5, () => mapFromForLoop(map))Clon superficial:
var clonedMap = new Map(originalMap) var clonedSet = new Set(originalSet)Clon profundo:
var deepClonedMap = new Map(JSON.parse(JSON.stringify([...originalMap]))) var deepClonedSet = new Set(JSON.parse(JSON.stringify([...originalSet]))) let originalMap = new Map() let data = {a:'a',b:'b'} originalMap.set(1,data) let shallowCloned = new Map(originalMap) let deepCloned = new Map(JSON.parse(JSON.stringify([...originalMap]))) data.a = 'p' console.log('originalMap:',[...originalMap]) console.log('shallowCloned:',[...shallowCloned]) console.log('deepCloned:',[...deepCloned])