ES6数组对象去重复

数组对象去重复的原理很简单，就是利用对象，对象的key值只有一个。代码如下

           const template = [
                {
                    group_id: 1,
                    name: 1
                },
                {
                    group_id: 2,
                    name: 2
                },
                {
                    group_id: 3,
                    name: 3
                },
                {
                    group_id: 1,
                    name: 1
                },
                {
                    group_id: 2,
                    name: 2
                },
          ]    
          const hash = {}
          let templateList = template.reduceRight((item, next) => {
            if (!hash[next.group_id]) hash[next.group_id] = true && item.push(next)
            return item
          }, [])
          console.log(templateList)

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