javascript object - Dynamically setting a nested value using recursive function

Question

I am trying to set one of the nested subobject properties, but the nested level is dynamic.

how can I dynamically set the nested properties?

It's working only one level properties,i can't set next inner level....

my code:

function deSerialize(qualifiedNameArray, currentIndex, resultJSON, valueToBeInitializedForFinalNode)
{
    if (currentIndex  == (qualifiedNameArray.length - 1)){
        resultJSON [qualifiedNameArray[currentIndex++]] = valueToBeInitializedForFinalNode;
    }
    else
    {
        resultJSON [qualifiedNameArray[currentIndex++]] = {};
    }

    if (currentIndex < qualifiedNameArray.length)
        deSerialize( qualifiedNameArray, currentIndex, resultJSON, valueToBeInitializedForFinalNode);

    return resultJSON;
}


  var results = {"columnname":"person.name.first", "varcharvalue":"david", "objecttype" : "user"};
    var valueToBeInitializedForFinalNode = results["varcharvalue"];
    var qualifiedNameArray = results["columnname"].split('.');
    var resultJSON = {};
    deSerialize(qualifiedNameArray, 0, resultJSON, valueToBeInitializedForFinalNode);

possible duplicate of Dynamically access object propertys (JS) — Grundy
– Grundy, Commented May 19, 2015 at 6:46
So, in few words, if you've got a path, you'd like to set that path in an object to that value? I'm not sure what you want to do with currentIndex. Are you trying to serialize an array of objects? — Jack
– Jack, Commented May 19, 2015 at 6:46

mido · Accepted Answer · 2015-05-19 06:53:37Z

2

A simple solution might be, not sure if this is what you are looking for:

function makeObj(arry, initValue){
    var obj = {}, objRef  = obj, idx = 0;    
    while(idx < arry.length -1){
        obj[arry[idx]] = {};
        obj = obj[arry[idx]];
        idx++;
    }
    obj[arry[idx]] = initValue;
    return objRef;
}

usage:

resultJSON = makeObj( qualifiedNameArray, valueToBeInitializedForFinalNode);

another way is:

function makeObj(objRef, arry, initValue){
    var obj = objRef, idx = 0;    
    while(idx < arry.length -1){
        if(!obj[arry[idx]]) obj[arry[idx]] = {};
        obj = obj[arry[idx]];
        idx++;
    }
    if(!obj[arry[idx]]) obj[arry[idx]] = initValue;
}

this way, you do not change any values that might have been already present, usage:

makeObj( resultJSON, qualifiedNameArray, valueToBeInitializedForFinalNode);

edited May 19, 2015 at 6:53

answered May 19, 2015 at 6:48

mido

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4 Comments

deepak samuel Over a year ago

Hi, It's working only 3 level object...if i add one more inner object not working..........example..........var results = {"columnname":"person.name.deepak.samuel", "varcharvalue":"david", "objecttype" : "user"}; results is : { person: { name: { deepak: [Object] } } }

mido Over a year ago

@user3374541 how are you checking the value?

deepak samuel Over a year ago

using console.log(resultJSON);

mido Over a year ago

try checking using console.log(resultJSON.person.name.deepak);

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