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set-operation.js
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set-operation.js
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class SetOperation {
constructor() {
this.items = {}
}
// 添加新元素
add(element) {
if (!this.has(element)) {
this.items[element] = element
return true
}
return false
}
// 移除元素
delete(element) {
if (this.has(element)) {
delete this.items[element]
return true
}
return false
}
// 判断元素是否存在集合中
has(element) {
return Object.prototype.hasOwnProperty.call(this.items, element)
}
// 移除集合中所有元素
clear() {
this.items = {}
}
// 返回集合所包含元素的数量
size() {
return Object.keys(this.items).length
}
// 返回一个包含集合中所有值(元素)的数组
values() {
return Object.values(this.items)
}
// 并集
union(otherSet) {
const unionSet = new SetOperation()
this.values().forEach(value => unionSet.add(value))
otherSet.values().forEach(value => unionSet.add(value))
return unionSet
}
// 交集
intersection(otherSet) {
const intersectionSet = new SetOperation()
const values = this.values()
const otherValues = otherSet.values()
let biggerSet = values
let smallerSet = otherValues
// 比较
if (otherValues.length - values.length > 0) {
biggerSet = otherValues
smallerSet = values
}
smallerSet.forEach(value => {
if (biggerSet.includes(value)) {
intersectionSet.add(value)
}
})
return intersectionSet
}
// 差集
difference(otherSet) {
const differenceSet = new SetOperation()
this.values().forEach(value => {
if (!otherSet.has(value)) {
differenceSet.add(value)
}
})
return differenceSet
}
// 子集
isSubsetOf(otherSet) {
if (this.size() > otherSet.size()) return false;
let isSubset = true
this.values().every(value => {
if (!otherSet.has(value)) {
isSubset = false
return false
}
return true
})
return isSubset
}
}
// test
const xxxA = new SetOperation()
xxxA.add(111)
xxxA.add(222)
xxxA.add(333)
const xxxB = new SetOperation()
xxxB.add(333)
xxxB.add(444)
xxxB.add(555)
xxxB.add(666)
const unionB = xxxA.union(xxxB)
console.log('并集 = ', unionB);
const intersectionB = xxxA.intersection(xxxB)
console.log('交集 = ', intersectionB.values());
const differenceB = xxxA.difference(xxxB)
console.log('差集 = ', differenceB.values());
const xxxAA = new SetOperation()
xxxAA.add(111)
xxxAA.add(222)
xxxAA.add(333)
const xxxBB = new SetOperation()
xxxBB.add(333)
console.log('AA是BB的子集', xxxAA.isSubsetOf(xxxBB));
console.log('BB是AA的子集', xxxBB.isSubsetOf(xxxAA));