I need to extract the supplier property from nested arrays.
Is there a better and simpler way to do this? Only display it once if it has duplicates
Expected Output should be like:
['Moscow', 'USA']
const oldData = [
{
"uid": "AA1",
"members": [
{
"id": 123,
"createdTs": "2018-11-07T04:55:00.000+00:00",
"modifiedTs": "2022-03-17T23:29:06.000+00:00",
"uid": "d@yahoo.com",
"name": "Dayanara",
"active": true,
"lastLogin": "2020-10-28T03:22:22.000+00:00",
"supplier": "Moscow"
},
{
"id": 456,
"createdTs": "2018-10-28T22:42:57.000+00:00",
"modifiedTs": "2020-06-01T05:01:11.000+00:00",
"uid": "j@yahoo.com",
"name": "John Jones",
"active": true,
"lastLogin": "2020-06-01T05:00:35.000+00:00",
"supplier": null
},
{
"id": 789,
"createdTs": "2022-01-28T05:21:37.000+00:00",
"modifiedTs": "2022-02-04T06:24:54.000+00:00",
"uid": "g@gmail.com",
"name": "Gasmund",
"active": true,
"lastLogin": null,
"supplier": ""
}
]
},
{
"uid": "AA2",
"members": [
{
"id": 10112,
"createdTs": "2022-07-07T09:51:14.000+00:00",
"modifiedTs": "2022-07-07T09:51:14.000+00:00",
"uid": "aa@yahoo.com",
"name": "deqwd",
"active": true,
"lastLogin": null,
"supplier": "USA"
},
{
"id": 101123,
"createdTs": "2022-07-07T09:51:14.000+00:00",
"modifiedTs": "2022-07-07T09:51:14.000+00:00",
"uid": "aa33@yahoo.com",
"name": "fewfewffwef",
"active": true,
"lastLogin": null,
"supplier": "USA"
}
]
}
]
const newData = oldData.flatMap((groupUsers) => (
groupUsers.members.map(({ supplier }) => ({
supplier: supplier
}))
));
console.log(newData)A double Array.flatMap will help.
If you have duplicates and expect unique list as output, use can use Set
First flatMap to generate a list of members, second flatMap to generate the list of supplier and a Set to generate the unique list from this.
const oldData = [
{
uid: "AA1",
members: [
{ id: 123, createdTs: "2018-11-07T04:55:00.000+00:00", modifiedTs: "2022-03-17T23:29:06.000+00:00", uid: "d@yahoo.com", name: "Dayanara", active: true, lastLogin: "2020-10-28T03:22:22.000+00:00", supplier: "Moscow" },
{ id: 456, createdTs: "2018-10-28T22:42:57.000+00:00", modifiedTs: "2020-06-01T05:01:11.000+00:00", uid: "j@yahoo.com", name: "John Jones", active: true, lastLogin: "2020-06-01T05:00:35.000+00:00", supplier: null },
{ id: 789, createdTs: "2022-01-28T05:21:37.000+00:00", modifiedTs: "2022-02-04T06:24:54.000+00:00", uid: "g@gmail.com", name: "Gasmund", active: true, lastLogin: null, supplier: "" },
],
},
{
uid: "AA2",
members: [
{ id: 10112, createdTs: "2022-07-07T09:51:14.000+00:00", modifiedTs: "2022-07-07T09:51:14.000+00:00", uid: "aa@yahoo.com", name: "deqwd", active: true, lastLogin: null, supplier: "USA" },
],
},
];
const newData = oldData
.flatMap(({ members }) => members)
.flatMap(({ supplier }) => (supplier ? supplier : []));
const uniqueSet = Array.from(new Set(newData));
console.log(newData);
console.log(uniqueSet);You could use filter to exclude the empty strings, flatMap to collect the rest of the values, and Set to get unique values:
const oldData = [{"members": [{"supplier": "Moscow"},{"supplier": null},{"supplier": ""}]},{"members": [{"supplier": "USA"},{"supplier": "USA"}]}];
const newData = Array.from(new Set(
oldData.flatMap(({members}) =>
members.map(({supplier}) => supplier).filter(Boolean)
)
));
console.log(newData);Alternative approach with Array.prototype.reduce:
const newData = Array.from(new Set(oldData
.reduce((p, c) => p.concat(c.members.filter(m => !!m.supplier)) , [])
.reduce((p, c) => p.concat(c.supplier), [])
));