js中set集合是什么呢？不知道的小伙伴來(lái)看看陽(yáng)泰小編今天的分享吧!

1、set集合的定義

?集合成員是無(wú)序的，是不重復(fù)的一組成員。

開(kāi)發(fā)中可用于去除重復(fù)數(shù)據(jù)

set集合和map不一樣。這里只實(shí)現(xiàn)了set集合的方法。

map是用哈希結(jié)構(gòu)的定義來(lái)實(shí)現(xiàn)的，本質(zhì)上也是對(duì)數(shù)組和鏈的結(jié)合。

2、封裝對(duì)象?

????????此處用對(duì)象的方式來(lái)實(shí)現(xiàn)集合?function?Set(){????????this.items={}}

?3、新增值

????默認(rèn)set的健名是其健值?Set.prototype.add=function(value){????????????if(this.has(value)){????????????????return?false????????????}?????????????this.items[value]=value????????????return?true????????}

4、刪除值

??Set.prototype.has=function(value){????????????return?this.items.hasOwnProperty(value)????????}?????????Set.prototype.remove=function(value){????????????if(!this.has(value)){????????????????return?false????????????}????????????delete?this.items[value]????????????return?true????????}

5.一般方法

?Set.prototype.clear=function(){????????????this.items={}????????}????????Set.prototype.size=function(){????????????return?Object.keys(this.items).length????????}?????????Set.prototype.values=function(){????????????return?Object.keys(this.items)????????}

6、并集?

?Set.prototype.union=function(otherSet){????????????var?unionSet=new?Set()????????????var?values=this.values()????????????for(var?i=0;i
?7、交集
Set.prototype.intersection=function(otherSet){????????????var?intersectionSet=new?Set()????????????var?values=this.values()????????????for(var?i=0;i
8、補(bǔ)集
??Set.prototype.difference=function(otherSet){????????????var?differenceSet=new?Set()????????????var?values=this.values()????????????for(var?i=0;i
9、子集?
?Set.prototype.subset=function(otherSet){????????????????????????var?values=this.values()????????????for(var?i=0;i