javascript - Grouping objects in an array by multiple keys -


initially, i've array:

[{     "vendorid": 1,     "vendorname": "vendor1",     "maxfilelimit": 2,     "uploadfilename": "voice1.xlsx" }, {     "vendorid": 1,     "vendorname": "vendor1",     "maxfilelimit": 2,     "uploadfilename": "ven1_voice.xlsx" }, {     "vendorid": 2,     "vendorname": "vendor2",     "maxfilelimit": 2,     "uploadfilename": "voice2.xlsx" }, {     "vendorid": 2,     "vendorname": "vendor2",     "maxfilelimit": 2,     "uploadfilename": "ven2_voice.xlsx" }]

i want file names in array no repetition of records. so, expect output similar following:

[{     "vendorid": 1,     "vendorname": "vendor1",     "maxfilelimit": 2,     "uploadfilename": ["voice1.xlsx", "ven1_voice.xlsx"] }, {     "vendorid": 2,     "vendorname": "vendor2",     "maxfilelimit": 2,     "uploadfilename": ["voice2.xlsx", "ven2_voice.xlsx"] }]

i found solutions d3.js, alasql not getting output expected

you can use array#reduce , inside can store result in object , extract values using object.values().

var data = [{"vendorid": 1,"vendorname": "vendor1","maxfilelimit": 2,"uploadfilename": "voice1.xlsx"},{"vendorid": 1,"vendorname": "vendor1","maxfilelimit": 2,"uploadfilename": "ven1_voice.xlsx"},{"vendorid": 2,"vendorname": "vendor2","maxfilelimit": 2,"uploadfilename": "voice2.xlsx"},{"vendorid": 2,"vendorname": "vendor2","maxfilelimit": 2,"uploadfilename": "ven2_voice.xlsx"}];    var result = data.reduce((hash, obj) => {    let key = obj.vendorid+'|' +obj.vendorname+'|' +obj.maxfilelimit;    if(hash[key])        hash[key].uploadfilename.push(obj.uploadfilename);    else {        hash[key] = obj;        hash[key].uploadfilename = [obj.uploadfilename];      }     return hash;   },{});  console.log(object.values(result));
.as-console-wrapper { max-height: 100% !important; top: 0; }


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