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set.js
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set.js
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class Set {
constructor() {
this.items = {}
}
//判断元素是否在集合中
has(element) {
return Object.prototype.hasOwnProperty.call(this.items, element)
}
//增加
add(element) {
if (!this.has(element)) {
this.items[element] = element
}
}
//删除
delete(element){
if(this.has(element)){
delete this.items[element]
}
}
//清空
clear(){
this.items={}
}
//集合中元素数量
size(){
return Object.keys(this.items).length
}
//返回所有值构成的数组
values(){
return Object.values(this.items)
}
//并集
union(otherSet){
const unionSet=new Set()
this.values().forEach(value => unionSet.add(value));
otherSet.values().forEach(value => unionSet.add(value));
return unionSet
}
//交集
}
/* //并集
const a=new Set()
const b=new Set()
a.add(1)
a.add(2)
a.add(3)
b.add(2)
b.add(3)
b.add(5) */