I am trying to write a javascript recursive function that receives one parameter – nested JSON object.
The function goes through the potentially infinitely nested object and converts all the keys (property names) to a string that is stored in array. Array is returned to a place where the function was called.
Example of JSON object:
{
OBJECT1: {
ATTRIBUTE3: {
PARAMETER2: {
PROPERTY1: {
}
}
}
}
}
The object does not hold any values.
What i tried and did not work:
function convertKeysToString(obj) {
let keys = [];
for (let key in obj) {
if (typeof obj[key] === 'object') {
keys = keys.concat(convertKeysToString(obj[key]));
} else {
keys.push(key.toString());
}
}
return keys;
}
As a result, I expected that returned key is pushed to an array, but the funciton didnt get the key at all or was not pushed to keys array.
Another code I tried:
function getNestedObjectKeys(obj) {
var keys = []
var firstLevel = null
var property = Object.keys(obj)
property = property[0]
firstLevel = Object.keys(obj[property])[0]
if (firstLevel == undefined) {
return 0
}
let returnedValue = keys.unshift(getNestedObjectKeys(obj[property]))
if (returnedValue == 0) {
return Object.keys(obj[property])[0]
}
returnedValue = Object.keys(obj[property])[0]
if (returnedValue != obj[property[0]]) {
return Object.keys(obj[property])[0]
}
else if (returnedValue == firstLevel) {
return keys
}
}
The function should return the key name and push (unshift) it to string and then return it, but the unshift doesnt do what I expect and in the returnedValue is not a expected returned string.
I approached it the way that the function findd the deepest (empty) object, and starts returning the name of the key. The thing is that I must return the key name AND push it to the string, which I can’t find the way to accomplish at once.
2
Answers
Your first solution is pretty close, but has one problem (well, one main problem): when the value is type
object
, you don’t add its key to the array. So how is it supposed to get into the array? Give this a shot:Other things you may want to consider:
typeof null
isobject
.typeof []
is alsoobject
.You could have a look to object, which are truthy and typeof object.