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JS數(shù)組格式合并轉(zhuǎn)換

JavaScript

翻翻過(guò)去那場(chǎng)雪 2019-05-25 15:24:59

有如下數(shù)組varsourceList=[{SupportProgramId:1,Category:"AAA",SubCategory:"A-1"},{SupportProgramId:2,Category:"AAA",SubCategory:"A-2"},{SupportProgramId:3,Category:"AAA",SubCategory:"A-3"},{SupportProgramId:4,Category:"BBB",SubCategory:"B-1"},{SupportProgramId:5,Category:"CCC",SubCategory:"C-1"},{SupportProgramId:6,Category:"CCC",SubCategory:"C-2"}];要求轉(zhuǎn)換成如下格式：[{mainTitle:"AAA"subList:[{subId:1subTitle:"A-1"},{subId:2subTitle:"A-2"},{subId:3subTitle:"A-3"}]},{mainTitle:"BBB"subList:[{subId:4subTitle:"B-1"}]},{mainTitle:"CCC"subList:[{subId:5subTitle:"C-1"},{subId:6subTitle:"C-2"}]}]求好的轉(zhuǎn)換過(guò)程，可以使用es6或lodash提供的方法

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供參考vardata=Array.from(sourceList.reduce((map,{SupportProgramId:subId,Category:mainTitle,SubCategory:subTitle})=>{if(map.has(mainTitle)){map.get(mainTitle).subList.push({subId,subTitle})}else{map.set(mainTitle,{mainTitle,subList:[{subId,subTitle}]})}returnmap},newMap()).entries())

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TA貢獻(xiàn)1860條經(jīng)驗(yàn) 獲得超8個(gè)贊

functionconvert(arr){varexists={}varresult=[]arr.forEach(v=>{if(exists[v.Category]){exists[v.Category].push({subId:v.SupportProgramId,subTitle:v.SubCategory})}else{exists[v.Category]=[{subId:v.SupportProgramId,subTitle:v.SubCategory}]}})for(varkeyinexists){result.push({mainTitle:key,subList:exists[key]})}returnresult}//...console.log(convert([{SupportProgramId:1,Category:"AAA",SubCategory:"A-1"},{SupportProgramId:2,Category:"AAA",SubCategory:"A-2"},{SupportProgramId:3,Category:"AAA",SubCategory:"A-3"},{SupportProgramId:4,Category:"BBB",SubCategory:"B-1"},{SupportProgramId:5,Category:"CCC",SubCategory:"C-1"},{SupportProgramId:6,Category:"CCC",SubCategory:"C-2"}]))