I am trying to convert the following array into an object:
var arr = [
'car.name',
'car.age',
'car.event.id',
'zz.yy.dd.aa',
'aa.yy.zz.dd.kk'
];
So it will look like this:
var targetObject = {
car: {
name: '',
age: '',
event: {
id: ''
}
}
,
zz: {
yy: {
dd: {
aa: ''
}
}
},
aa: {
yy: {
zz: {
dd: {
kk: '',
}
}
}
}
}
This is my code:
targetObject = {}
function arrayToObject(arr){
//iterate through array and split into items
for (var i = 0; i < arr.length; ++i){
var item = arr[i].split(".");
//iterate through item that has just been splitted
for (var u = 0; u < item.length; ++u){
//if item is not in targetobject create new object
if(!(item[0] in targetObject)){
targetObject[item[0]] = {}
} else {
//else go into the object and add the item/property to the existing object
targetObject[item[0]][item[u]] = {}
}
}
}
console.log(targetObject);
}
arrayToObject(arr);
It outputs only in second level and i can't figure out to do it with the several levels. I know the code is oldschool, so I would also really like to know how this can be done easier.
You could use forEach to loop over array and then split with reduce to build nested object.
var arr = [
'car.name',
'car.age',
'car.event.id',
'zz.yy.dd.aa',
'aa.yy.zz.dd.kk'
];
const result = {}
arr.forEach(str => {
str.split('.').reduce((r, e, i, a) => {
return r[e] = (r[e] || (a[i + 1] ? {} : ''))
}, result)
})
console.log(result)Or with your approach with for loops you just need to keep some reference and update the current nested object, so you could do it like this.
var arr = [
'car.name',
'car.age',
'car.event.id',
'zz.yy.dd.aa',
'aa.yy.zz.dd.kk'
];
const targetObject = {}
let ref = targetObject;
function arrayToObject(arr) {
//iterate through array and split into items
for (var i = 0; i < arr.length; ++i) {
var item = arr[i].split(".");
//iterate through item that has just been splitted
for (var u = 0; u < item.length; ++u) {
const last = u == item.length - 1
const str = item[u]
if (!ref[str]) {
ref[str] = (last ? '' : {})
}
ref = ref[str]
if (last) {
ref = targetObject;
}
}
}
}
arrayToObject(arr);
console.log(targetObject)