Navigate through nested JSON structure without prior knowledge of specific layer names

Is it feasible to iterate through this complex nested object without prior knowledge of the varying views ("A", "B", "C", etc.) it contains? I currently rely on an alphabetic index, but I've been informed that the "view layer" might have diverse names, rendering my existing approach ineffective. Is there a method to traverse this object dynamically without knowing the specific view names like "A," "B," or "C"?

Snippet from My Current Code


loopThroughObject()
{
   let alphabet = ["A", "B", "C"];
   let index = 0;

   this.all_tables.views.forEach(views => {

      views[alphabet[index]].forEach(view => {

         view.positionen.forEach(position=> {
           alert( position.field1);
         });

      });

      index++;
});
}

Nested JSON Object Structure


 all_tables = {  
   "views":[  
      {  
         "A":[  
            {  
               "id":"",
               "username":"",
               "status":"",
               "location":"",
               "positionen":[  
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  },
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  },
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  }
               ]
            },
            {  
               "id":"",
               "username":"",
               "status":"",
               "location":"",
               "positionen":[  
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  },
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  },
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  }
               ]
            }
         ],
         "B":[  
            {  
               "id":"",
               "username":"",
               "status":"",
               "location":"",
               "positionen":[  
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  },
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  },
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  }
               ]
            },
            {  
               "id":"",
               "username":"",
               "status":"",
               "location":"",
               "positionen":[  
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  },
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  },
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  }
               ]
            }
         ],
         "C":[  
            {  
               "id":"",
               "username":"",
               "status":"",
               "location":"",
               "positionen":[  
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  },
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  },
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  }
               ]
            },
            {  
               "id":"",
               "username":"",
               "status":"",
               "location":"",
               "positionen":[  
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  },
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  },
                  {  
                     "field1":"",
                     "field2":"",
                     "field3":""
                  }
               ]
            }
         ]
      }
   ]
}
jsontypescriptloopsobjectnested

Answer №1

To accomplish this task, you have various Object methods at your disposal: Object.keys (introduced in ES5), Object.values (added in ES2017), and Object.entries (currently experimental). For a more general approach, the first method is recommended:

function iterateOverObject() {
  this.all_tables.views.forEach(views => {

    Object.keys(views).forEach(key => {
      let view = views[key];

      view.positions.forEach(position => {
        alert(position.field1);
      });

    });
  });
}

Answer №2

It appears that there may be some inaccuracies in the JSON structure provided.

One issue is that the views property is defined as an array with only one item, which is an object containing view items. It might be more appropriate to have views structured as an object initially since JavaScript does not support associative arrays.

"views": {  
         "A":[ .. ],
         "B":[ .. ],
         ...
}

By organizing it this way, you can utilize Object methods like Object.keys(), Object.values(), or Object.entries() for iteration purposes.

Object.values(this.all_tables.views).forEach(viewGroup => {

     viewGroup.forEach(view => {

         view.positionen.forEach(position=> {
           alert( position.field1);
         });
     });
});

If you wish to delve deeper into this topic, please refer to:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object#Methods_of_the_Object_constructor

Answer №3

Below is the code snippet that can be utilized:

function iterateObject()
{
    let index = 0;
    this.all_tables.views.forEach(views => {
       for (var key in views) {
           views[key].forEach(view => {
               view.positions.forEach(position=> {
                   alert( position.field1);
               });
           });
       }
       index++;
   });
}

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