Firstly I need to group an array of object with respect to policy attribute's value. Then I need to group action and company fields. I tried to use lodash but could not get to the nested arrays.
From this =>
[
{
"action": "VIEW",
"policy": "FORM"
},
{
"action": "CREATE",
"policy": "USER"
},
{
"action": "VIEW",
"policy": "USER"
},
{
"company": "Microsoft",
"policy": "FORM"
},
{
"company": "Facebook",
"policy": "USER"
},
{
"company": "Twitter",
"policy": "USER"
}
]
to this =>
{
"FORM": {
"action": ["VIEW"],
"company": ["Microsoft"]
},
"USER": {
"action": ["CREATE", "VIEW"],
"company": ["Facebook", "Twitter"]
}
}
Thanks a lot
You can do this using a simple for...of loop and some destructuring:
const data = [ { action: 'VIEW', policy: 'FORM', }, { action: 'CREATE', policy: 'USER', }, { action: 'VIEW', policy: 'USER', }, { company: 'Microsoft', policy: 'FORM', }, { company: 'Facebook', policy: 'USER', }, { company: 'Twitter', policy: 'USER', }, ];
let result = {};
for (const { action, policy, company } of data) {
result[policy] = result[policy] ?? { action: [], company: [] };
if (action) result[policy].action.push(action);
if (company) result[policy].company.push(company);
}
console.log(result);You could also do this using array#reduce instead of a for loop:
const data = [ { action: 'VIEW', policy: 'FORM' }, { action: 'CREATE', policy: 'USER' }, { action: 'VIEW', policy: 'USER' }, { company: 'Microsoft', policy: 'FORM' }, { company: 'Facebook', policy: 'USER' }, { company: 'Twitter', policy: 'USER' }, ];
const result = data.reduce((result, { action, company, policy }) => {
result[policy] = result[policy] ?? { action: [], company: [] };
action && result[policy].action.push(action);
company && result[policy].company.push(company);
return result;
}, {});
console.log(result);You could group by policy and separate the rest of the array and build nested groups.
const
data = [{ action: "VIEW", policy: "FORM" }, { action: "CREATE", policy: "USER" }, { action: "VIEW", policy: "USER" }, { company: "Microsoft", policy: "FORM" }, { company: "Facebook", policy: "USER" }, { company: "Twitter", policy: "USER" }],
result = Object.values(data.reduce((r, { policy, ...o }) => {
r[policy] ??= {};
Object
.entries(o)
.forEach(([k, v]) => (r[policy][k] ??= []).push(v));
return r;
}, {}));
console.log(result);.as-console-wrapper { max-height: 100% !important; top: 0; }By this function, you can group by any field value .
const groupBy = (x, f) => x.reduce((a, b) => ((a[f(b)] ||= []).push(b), a), {})
For group by policy
groupBy(data, v => v.policy)