CODEWITHSUNDEEP
javascriptjsonfor-loopunderscore.js
user521024
user521024

Reputation: 531

Underscore JavaScript find value exists for key in complex Object

I have the following JSON format which is dynamic i.e., number of children can be different at anytime.

var Obj = {
    "name": "A",
    "count": 13,
    "children": [{
        "name": "B",
        "count": 24,
        "children": [{
            "name": "C",
            "count": 35,
            "children": [],
            "msg": null
        },{
            "name": "D",
            "count": 35,
            "children": [],
            "msg": "Err"
        }]
    }]
}

How can we find if msg is not null in entire object Obj? I tried to use loop through objects but this format is not consistent as children array in the object is dynamic.I am new to underscore, Is there anyway to check with Underscore JavaScript?

Upvotes: 0

Views: 1175

Answers (3)

Chris
Chris

Reputation: 322

If I understood your question correctly...

var anyMsgNotNull = (_.filter(Obj.children, function(child) {
    return (child.msg !== null);
  })).length > 0;

This will return true if there are any msg elements that are not null, otherwise it will return false.

Upvotes: 1

hardy
hardy

Reputation: 901

Yes Underscore the library which can help out like this:-

_.each(Obj.children,function(item){ //it will take item one by one and do 
                                    //  processing
  if(item.msg){
      //DO YO THING
   }
   return;
})

Upvotes: 0

Nenad Vracar
Nenad Vracar

Reputation: 122037

In plain js you can create recursive function using for...in loop that will return false if property with key msg and value null is found otherwise it will return true

var Obj = {"name":"A","count":13,"children":[{"name":"B","count":24,"children":[{"name":"C","count":35,"children":[],"msg":null},{"name":"D","count":35,"children":[],"msg":"Err"}]}]}

function notNull(obj) {
  var result = true;
  for (var i in obj) {
    if (i == 'msg' && obj[i] === null) result = false;
    else if (typeof obj[i] == 'object') result = notNull(obj[i]);
    if (result == false) break;
  }
  return result;
}

console.log(notNull(Obj))

Upvotes: 0

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