js对象数组分组

按照某个字段进行分组

let groupData = [
		{name: "张三",project: "语文",score: "90"},
	    {name: "张三",project: "数学",score: "88"}, 
	    {name: "张三",project: "英语",score: "86"}, 
	    {name: "张三",project: "物理",score: "96"},
	    {name: "李四",project: "语文",score: "92"},
	    {name: "李四",project: "数学",score: "86"}
   	];

    function groupByName(groupData) {
          let result = groupData.reduce((prevValue, currentValue) => {
              let index = -1;
              prevValue.some((item, i) => {
                  if (item.name == currentValue.name) {
                      index = i;
                      return true;
                  }
              })
              if (index > -1) {
                  prevValue[index].projectAndScore.push({
                      project: currentValue.project,
                      score: currentValue.score
                  })
              } else {
                  prevValue.push({
                      name: currentValue.name,
                      projectAndScore: [{
                          project: currentValue.project,
                          score: currentValue.score
                      }]
                  })
              }
              return prevValue;
          }, []);
          console.log(result);
          return result;
      }
      groupByName(groupData);

分组结果如下：