Converting array of objects into nested form - angularjs

Question

I have an array of objects in this form
nnz=[{
"verb":"has",
"nouns": "employees"
},
{
"verb":"has",
"nouns": "managers"
},
{
"verb":"have",
"nouns": "departments"
}
]
but i want to convert it into this form
[ {
"verb":"has",
"nouns": ["employees", "managers"]
},
{
"verb":"have",
nouns:["departments"]
}
]
and this work has to be done from client side. I am working in node.js. I want to allow user to select multiple nouns against each verb and when user selects nouns against verb it should be saved into an array in the above given form. I am unable to figure it out how can i implement this logic.
Update: we have to check verb too.now it became more tricky.

Answer 1

You can do somethong like this, using some Array built-in functions:
const array = [
{
"verb":"has",
"nouns": "employees"
},
{
"verb":"has",
"nouns": "managers"
},
{
"verb":"has",
"nouns": "departments"
}
]
const aggregated = array.reduce( (arr, el) =>{
let found = arr.find(ll => ll.verb == el.verb);
if(found) found.nouns.push(el.nouns);
else arr.push({verb : el.verb, nouns : [el.nouns] })
return arr;
}, []);
console.log(aggregated);

Answer 2

First create a temporary object that uses the verb value as keys then iterate your existing data pushing nouns to corresponding array in that temporary object.
Then map the temporary object to a new array.
nnz = [{
"verb": "has",
"nouns": "employees"
}, {
"verb": "has",
"nouns": "managers"
}, {
"verb": "has",
"nouns": "departments"
}]
var tmp = {};
nnz.forEach(function(item) {
tmp[item.verb] = tmp[item.verb] || {
verb: item.verb,
nouns: []
};
tmp[item.verb].nouns.push(item.nouns);
});
var results = Object.keys(tmp).map(function(key) {
return tmp[key];
});
console.log(results);

Answer 3

Try these two approaches as per your requirement. I hope it will work as per the expectation .
First Approach :
When you know the property names :
var nnz = [{
"verb":"has",
"nouns": "employees"
},
{
"verb":"has",
"nouns": "managers"
},
{
"verb":"has",
"nouns": "departments"
}
];
var newObj = {};
var nouns = [];
for (var i in nnz) {
nouns.push(nnz[i].nouns);
newObj.verb = nnz[i].verb;
newObj.nouns = nouns;
}
nnz = newObj;
console.log(nnz);
Second Approach :
When you don't know the property names :
var nnz = [{
"verb":"has",
"nouns": "employees"
},
{
"verb":"has",
"nouns": "managers"
},
{
"verb":"has",
"nouns": "departments"
}
];
var newObj = {};
var nounsArr = [];
for (var i in nnz) {
nounsArr.push(nnz[i][Object.keys(nnz[i])[1]])
nnz[i][Object.keys(nnz[i])[1]] = nounsArr;
var Objlen = Object.keys(nnz[i]).length;
for (var j=0;j<Objlen;j++) {
var objKeys = Object.keys(nnz[i])[j];
newObj[objKeys] = nnz[i][objKeys];
}
}
nnz = newObj;
console.log(nnz);