Exploring JSON data through key-value pairs

Question

Exploring JSON data through key-value pairs

When faced with a de-serialized JSON object that has an arbitrary structure and mixed value types...

var data = {
  'a':'A1',
  'b':'B1',
  'c': [
    {'a':'A2', 'b':true}, 
    {'a':'A3', 'b': [1, 2, 3]}
  ]};

The goal is to extract an array of values that correspond to a specific key.

> my_func(data, 'a')
['A1', 'A2', 'A3']

> my_func(data, 'b')
['B1', true, [1, 2, 3]]

The current implementation returns the correct result, but there may be room for improvement in terms of efficiency or readability.

my_func = function(o,s,a){
    var a = a || [];
    if(o == null){
        return a;
    }
    if(s in o){
        a.push(o[s]);
    }
    for(e in o){
        if(typeof(o[e]) == "object"){
            a.concat(my_func(o[e], s, a))
        }
    }
    return a;
}

Open to suggestions for enhancements.

javascript json

Answer 1

Answer №1

function exploreObject(obj, callback, parent) {
  for (key in obj){
    callback.apply(this,[key,obj[key],parent]);      
    if (obj[key] instanceof Object && !(obj[key] instanceof Array)) {
      exploreObject(obj[i],callback, key);
    }
  }
}

function findPropertyByRecursion(obj, propertyToFind){
  var result = [];
  exploreObject(obj, function(key, value, parent){
    if(key === propertyToFind){
      result.push({parent: parent, value: value});
    }
  });
  return result;
}

usage example:

findPropertyByRecursion( myNestedObj, 'search' )

where myNestedObj represents the nested object and search is the target key to find

Answer 2

function exploreObject(obj, callback, parent) {
  for (key in obj){
    callback.apply(this,[key,obj[key],parent]);      
    if (obj[key] instanceof Object && !(obj[key] instanceof Array)) {
      exploreObject(obj[i],callback, key);
    }
  }
}

function findPropertyByRecursion(obj, propertyToFind){
  var result = [];
  exploreObject(obj, function(key, value, parent){
    if(key === propertyToFind){
      result.push({parent: parent, value: value});
    }
  });
  return result;
}

usage example:

findPropertyByRecursion( myNestedObj, 'search' )

where myNestedObj represents the nested object and search is the target key to find

Answer 3

Answer №2

Utilize the replacer argument within JSON.stringify for optimal results:

function extract_data(obj, property) {
  var output = [];
  JSON.stringify(obj, function(key, value) {
    if (key === property) output.push(value);
    return value;
  });
  return output;
}

Answer 4

Utilize the replacer argument within JSON.stringify for optimal results:

function extract_data(obj, property) {
  var output = [];
  JSON.stringify(obj, function(key, value) {
    if (key === property) output.push(value);
    return value;
  });
  return output;
}

Answer 5

Answer №3

Gratitude to everyone for sharing your insights. Your contributions have guided me towards a solution that I find much more satisfying.

traverseObject = function(obj, callback){
    for(prop in obj){
        callback(prop, obj[prop]);
        if(typeof(obj[prop]) == "object"){
            traverseObject(obj[prop], callback);
        }
    }
}

getValuesByKey = function(obj, keyToFind){
    var result = [];
    traverseObject(obj, function(key, value){
        if(key == keyToFind){
            result.push(value);
        }
    });
    return result;
}

Answer 6

Gratitude to everyone for sharing your insights. Your contributions have guided me towards a solution that I find much more satisfying.

traverseObject = function(obj, callback){
    for(prop in obj){
        callback(prop, obj[prop]);
        if(typeof(obj[prop]) == "object"){
            traverseObject(obj[prop], callback);
        }
    }
}

getValuesByKey = function(obj, keyToFind){
    var result = [];
    traverseObject(obj, function(key, value){
        if(key == keyToFind){
            result.push(value);
        }
    });
    return result;
}

Exploring JSON data through key-value pairs

Answer №1

Answer №2

Answer №3

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