get all Objects inside an array of objects

Question

I am new to reactjs and javascript as well.

Here, I have an array of object which is like ,

[
  {
    "id": "CSS",
    "questionCount": [
      {
        "level": "TOUGH",
        "type": "NON_CODE",
        "count": "1"
      }
    ]
  },
  {
    "id": "Backbone",
    "questionCount": [
      {
        "level": "TOUGH",
        "type": "CODE",
        "count": "2"
      },
      {
        "level": "TOUGH",
        "type": "NON_CODE",
        "count": "5"
      },
      {
        "level": "MEDIUM",
        "type": "NON_CODE",
        "count": "7"
      },
      {
        "level": "EASY",
        "type": "NON_CODE",
        "count": "6"
      }
    ]
  },
]

Now, here what I want is to have an array of object which will have all the objects that are present in the questionCount array. so, it will be like ,

[  {
        "level": "TOUGH",
        "type": "NON_CODE",
        "count": "1"
      },  {
        "level": "TOUGH",
        "type": "CODE",
        "count": "2"
      },
      {
        "level": "TOUGH",
        "type": "NON_CODE",
        "count": "5"
      },
      {
        "level": "MEDIUM",
        "type": "NON_CODE",
        "count": "7"
      },
      {
        "level": "EASY",
        "type": "NON_CODE",
        "count": "6"
      } ]

So, can any one help me with this ?

SO is not for what I want, its for I'm stuck here. Please google stuff, try few approaches and if you fail again, please share the attempt in the question and we will help you rectify your mistake — Rajesh Dixit
– Rajesh Dixit, Commented Nov 5, 2018 at 5:12
I dont know your background, but I suggest you make an effort to solve it yourself and if stuck post it in SO, that way you will learn. Posting requirement might get solutions but for complex requirements you may not. — kiranvj
– kiranvj, Commented Nov 5, 2018 at 5:31
@kiranvj thanks actually I tried it and I have used the for loop for this problem as well. — ganesh kaspate
– ganesh kaspate, Commented Nov 5, 2018 at 5:57

Yosvel Quintero · Accepted Answer · 2018-11-05 05:24:19Z

6

You can use Array.prototype.reduce() with Array.prototype.concat():

const temp = [{"id": "CSS","questionCount": [{"level": "TOUGH","type": "NON_CODE","count": "1"}]},{"id": "Backbone","questionCount": [{"level": "TOUGH","type": "CODE","count": "2"},{"level": "TOUGH","type": "NON_CODE","count": "5"},{"level": "MEDIUM","type": "NON_CODE","count": "7"},{"level": "EASY","type": "NON_CODE","count": "6"}]},];
const result = temp.reduce((a, c) => a.concat(c.questionCount), []);

console.log(result);

edited Nov 5, 2018 at 5:24

answered Nov 5, 2018 at 5:18

Yosvel Quintero

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2 Comments

Yosvel Quintero Over a year ago

All solutions are very similar for this question. Your solution is good and you make it one minute first but i was not copying... You have my +1

Prasad Telkikar Over a year ago

My intention was not to say you copied, obviously you have more knowledge than me. but my concern was of duplicate answers for one question... +1 from my side

Prasad Telkikar · Accepted Answer · 2018-11-05 07:16:24Z

3

You can iterate through each element and concatenate it with result. Try with the followings:

var jsonObject = [{"id": "CSS","questionCount": [{"level": "TOUGH","type": "NON_CODE","count": "1"}]},{"id": "Backbone","questionCount": [{"level": "TOUGH","type": "CODE","count": "2"},{"level": "TOUGH","type": "NON_CODE","count": "5"},{"level": "MEDIUM","type": "NON_CODE","count": "7"},{"level": "EASY","type": "NON_CODE","count": "6"}]}]

var result = [];
for(var t of jsonObject){

  if(t.questionCount){
    //As t.questionCount is an array, we need to add property to each of the element present in that array
    t.questionCount.forEach(obj => obj.Id = t.id);
    result = result.concat(t.questionCount);
   }
   
}
console.log(result);

edited Nov 5, 2018 at 7:16

answered Nov 5, 2018 at 5:13

Prasad Telkikar

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7 Comments

ganesh kaspate Over a year ago

Hey thanks for the answer . I actually tried one more property in that object . so I tried t.questionCount and tried to add one property in this object

ganesh kaspate Over a year ago

t.questionCount["technology"] = t.id; used this way but it is not adding that

ganesh kaspate Over a year ago

Before concat I used this thing

Prasad Telkikar Over a year ago

would you like to add one more property to questionCount array?

ganesh kaspate Over a year ago

yes Exactly , because it has that specific technology . So, want to add that Id if you see in my questions array of object first one, there is one Id , so want to add that in this array as well.

|

akib khan · Accepted Answer · 2018-11-05 05:14:51Z

1

Lets say temp is given array, then you can can array of questionCount using following code:-

finalArr=[]
for(var i=0;i<temp.length;i++) 
    finalArray.push(temp[i].questionCount)

answered Nov 5, 2018 at 5:14

akib khan

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Comments

Shyam Tayal · Accepted Answer · 2018-11-05 05:13:21Z

0

This little peace of code will do it

var newData = [];
for (var i of data) {
  newData = newData.concat(i['questionCount'])
}

answered Nov 5, 2018 at 5:13

Shyam Tayal

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Comments

RedPandaz · Accepted Answer · 2018-11-05 05:21:01Z

0

With ES6 reduce and spread, you can do something like this

const x = arr.reduce((accum, curr) => {
    let newArr = [...accum, ...curr.questionCount];
    return newArr
}, [])

answered Nov 5, 2018 at 5:21

RedPandaz

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Comments

Abhishek · Accepted Answer · 2018-11-05 07:54:41Z

0

// -- Use the swiss-knife-tool :-) (Lodash)
// -- Taking x as your array in the question, 
// -- you can use lodash to map specific attribute 
// -- and then flatten the output array.

const y = _
  .chain(x)
  .map(item => item.questionCount)
  .flatten()
  .value();

console.log(y);

answered Nov 5, 2018 at 7:54

Abhishek

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