Exploring the depths of object recursion: a guide to looping endlessly

Question

Exploring the depths of object recursion: a guide to looping endlessly

What is the method to retrieve all values from an object and compare them?

Object :

obj = {
     a : 10,
     b : [{b1 : 101 , b2:201},{b3 : 102 , b4:204}],
     c : [{c1 : 107 , c2:209 ,d :[{d1:109},{d2:402}]}
}

function compareValues(101,obj) {           

   if (retrieveValueFromObject(obj,101)) {
       return true;
   } else {
      return false;
   } 

   function comparator(a, b) {
       return ('' + a).toLowerCase().indexOf(('' + b).toLowerCase()) > -1;
   }
}

Pending: retrieveValueFromObject() needs to be implemented in a way that it loops through all key-value pairs in the object and returns a flag (true/false) if the value is found in the object.

javascript angularjs

Answer 1

Answer №1

Here is a possible solution:

function checkValueInObject(obj, value) {
  for(let key in obj) {
      if(obj[key] == value) {
        return true;
      }
      if(typeof obj[key] === 'object' || Array.isArray(obj[key]))
       return checkValueInObject(obj[key], value);
  }
  return false;
}

I came across this code snippet on:

Answer 2

Here is a possible solution:

function checkValueInObject(obj, value) {
  for(let key in obj) {
      if(obj[key] == value) {
        return true;
      }
      if(typeof obj[key] === 'object' || Array.isArray(obj[key]))
       return checkValueInObject(obj[key], value);
  }
  return false;
}

I came across this code snippet on:

Answer 3

Answer №2

attempt:

function getValueFromObject(obj,101) {
    var outcome;
    for (var key in obj){
        if (typeof(obj[key]) !== 'Object')
            outcome = comparer(101, obj[key]);
        else
            outcome = retrieveValueFromObject(obj[key],101);
    }
    return outcome;
}

I have not had the chance to test this myself.

Answer 4

attempt:

function getValueFromObject(obj,101) {
    var outcome;
    for (var key in obj){
        if (typeof(obj[key]) !== 'Object')
            outcome = comparer(101, obj[key]);
        else
            outcome = retrieveValueFromObject(obj[key],101);
    }
    return outcome;
}

I have not had the chance to test this myself.

Answer 5

Answer №3

To efficiently extract all values from an object and store them in an array, a recursive function can be used along with the Array.prototype.indexOf() method for checking:

function extractValues(obj) {
    var result = [];
    for (var key in obj) {
        if (obj.hasOwnProperty(key)) {
            var curVal = obj[key];
            if (typeof(curVal) === 'object') {
                result = result.concat(extractValues(curVal));
            } else {
                result.push(curVal);
            }
        }
    }
    return result;
}
console.log(extractValues(o));
console.log(extractValues(o).indexOf(101) !== -1);
console.log(extractValues(o).indexOf('nosuchvalue') !== -1);

Playground

Answer 6

To efficiently extract all values from an object and store them in an array, a recursive function can be used along with the Array.prototype.indexOf() method for checking:

function extractValues(obj) {
    var result = [];
    for (var key in obj) {
        if (obj.hasOwnProperty(key)) {
            var curVal = obj[key];
            if (typeof(curVal) === 'object') {
                result = result.concat(extractValues(curVal));
            } else {
                result.push(curVal);
            }
        }
    }
    return result;
}
console.log(extractValues(o));
console.log(extractValues(o).indexOf(101) !== -1);
console.log(extractValues(o).indexOf('nosuchvalue') !== -1);

Playground

Exploring the depths of object recursion: a guide to looping endlessly

Answer №1

Answer №2

Answer №3

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