首頁猿問一個數(shù)組問題重復(fù)值合并問題

一個數(shù)組問題重復(fù)值合并問題

JavaScript

大話西游666 2019-05-21 17:11:13

constary=[{code:1,num:20,},{code:1,num:10,},{code:2,num:15,}]//怎樣得出下面結(jié)果？constary=[{code:1,num:30,},{code:2,num:15,}]

查看完整描述

2 回答

拉莫斯之舞

TA貢獻(xiàn)1820條經(jīng)驗獲得超10個贊

constary=[{code:1,num:20},{code:1,num:10},{code:2,num:15}]functionmerge(list){letresult=[]letcache={}list.forEach(item=>{letkey=item.codeletindex=cache[key]if(index!==undefined){result[index].num+=item.num}else{result.push(Object.assign({},item))cache[key]=result.length-1}})returnresult}merge(list)

反對回復(fù) 2019-05-21

慕碼人2483693

TA貢獻(xiàn)1860條經(jīng)驗獲得超9個贊

functionmerge(arr){letres={};for(letitemofarr){if(res[item.code])res[item.code].num+=item.num;elseres[item.code]={code:item.code,num:item.num};//Avoidmodifyingtheoriginalobject.}returnObject.values(res);}