Javascript Object traversal with String

Question

I need to traverse a JavaScript object with a stored string.

Sample string

var x = "Desserts"

Sample Object

  {
    "dataset":
      { 
      "Categories" : 
               [
                {
                 "Desserts" : 
                   [
                    "Sweets","Ice Creams","Pastry"
                   ]
                } ,
                {
                  "Juices and Beverages" :
                   [
                    "Cold","Hot","Fresh","Sodas"
                   ]
                }
         }
   }

If I traverse the object as dataset.Categories.x, it doesn't work[returns undefined] . How can I do this?

@PranavCBalan Sorry. I changed the question. I missed it out. — Aravind Bharathy, Jan 05 '15 at 06:40

Pranav C Balan · Accepted Answer · 2015-01-05T06:48:56.027

2

You should use dataset.Categories[0][x] instead of dataset.Categories[0].x

Take a look at : dot notation or the bracket notation

var x = "Desserts",
  data = {
    "dataset": {
      "Categories": [{
        "Desserts": ["Sweets", "Ice Creams", "Pastry"]
      }, {
        "Juices and Beverages": ["Cold", "Hot", "Fresh", "Sodas"]
      }]
    }

  }

alert(data.dataset.Categories[0][x]);

edited Jan 05 '15 at 06:48

answered Jan 05 '15 at 06:39

Pranav C Balan

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score 0 · Answer 2 · answered Jan 05 '15 at 06:39

var obj = {
    "dataset": {
        "Categories": [{
            "Desserts": ["Sweets", "Ice Creams", "Pastry"]
        }, {
            "Juices and Beverages": ["Cold", "Hot", "Fresh", "Sodas"]
        }]
    }
}


var x = 'Desserts';
var val = obj.dataset.Categories[0][x];
console.log(val);

JSFIDDLE.

Javascript Object traversal with String

2 Answers2