Set.md

#Set的使用

用Set实现数组的并集

const ninjas = ["Kuma", "Hattori", "Yagyu"];
const samurai = ["Hattori", "Oda", "Tomoe"]; 
const warriors = new Set([...ninjas, ...samurai]);

用Set实现数组的交集

const ninjas = new Set(["Kuma", "Hattori", "Yagyu"]);
const samurai = new Set(["Hattori", "Oda", "Tomoe"]);
const ninjaSamurais = new Set(
	[...ninjas].filter(ninja => samurai.has(ninja))
);

用Set实现数组的差集

const ninjas = new Set(["Kuma", "Hattori", "Yagyu"]);
const samurai = new Set(["Hattori", "Oda", "Tomoe"]);
const ninjaSamurais = new Set(
	[...ninjas].filter(ninja => !samurai.has(ninja))
);