javascript - find nested object key by its value

Question

I\'m trying to find key of object which is containing my value.

There is my object:

var obj = {}

obj[\"post1\"] = {
    \"title\":    \"title1\",
    \         


        

Answer 1

You pretty much have it, just add obj[key].title === val as mentioned by Chris G.

Here's an ES6 one liner that returns an array of all matches.

var obj = {}

obj["post1"] = {
    "title":    "title1",
    "subtitle": "subtitle1"
}

obj["post2"] = {
    "title":    "title2",
    "subtitle": "subtitle2"
}

const filterByTitle = (obj, title) => 
  Object.values(obj).filter(o => o.title === title);

console.log(filterByTitle(obj, 'title1'))

Answer 2

You have to access the subkey of the object:

 function obk (obj, prop, val) {
   return Object.keys(obj).find(key => obj[key][prop] === val);
 }

 console.log(obk(obj, "title", "title2"));

Or you could search all values of the subobject:

 function obk (obj, val) {
   return Object.keys(obj).find(key => Object.values( obj[key] ).includes(val)); 
 }

 console.log(obk(obj, "title2"))

Answer 3

You can use array map:

var obj = {}

obj["post1"] = {
    "title":    "title1",
    "subtitle": "subtitle1"
}

obj["post2"] = {
    "title":    "title2",
    "subtitle": "subtitle2"
}
//console.log(obj);
function obk (obj, val) {
    var result = "";
    Object.keys(obj).map(key => {
        if(obj[key].title === val)
            result = key;
    });
    return result;
}

console.log(obk(obj, "title2"));

Or use array find to optimize searching function:

var obj = {}

obj["post1"] = {
    "title":    "title1",
    "subtitle": "subtitle1"
}

obj["post2"] = {
    "title":    "title2",
    "subtitle": "subtitle2"
}
//console.log(obj);
function obk (obj, val) {
    result = Object.keys(obj).find(key => {
        if(obj[key].title === val)
            return key;
    });
    return result;
}

console.log(obk(obj, "title1"));