CODEWITHSUNDEEP
javascriptarrays
G Boomanikandan
G Boomanikandan

Reputation: 124

Array conversion gives string instead of array

I want to convert two arrays into another array format.

Here is my code:

var array1 = [ "Kolkata", "Begumpet", "Bellary"];

var array2 = [[[20,"Kolkata1"],[10,"Kolkata2c"]],
              [[0,"Begumpet1"],[10, "Begumpet2e"]],
              [[30, "Bellary1"],[0, "Bellary2a"]]]

console.log(array2);
var resultvalue = [];
for (i = 0; i < array2.length; i++) {
    var result = "";
    var m = 0;
    for (j = 0; j < array2[i].length; j++) {
        if(m==0){
            result += "label: '" + array1[i] + "',";
            m++;
        }
        result += " '" + array2[i][j][1] + "': " + array2[i][j][0] + ", ";
    }
    resultvalue.push(result);
}
console.log(resultvalue);

It's producing what I want, except that the result is a string, while I need the actual array.

The expected output object should be like this:

dataset = [
    {label:"Kolkata", "Kolkata1":20, "Kolkata2c":10},
    {label:"Begumpet", "Begumpet1":0, "Begumpet2e":10},
    {label:"Bellary", "Bellary1":30, "Bellary2a":0},
];

Upvotes: 1

Views: 93

Answers (5)

Tirthraj Barot
Tirthraj Barot

Reputation: 2679

There were some corrections in your desired output JSON object according to the best practices of structure of JSON. So According to what I felt to be valid, here is the correct code.

Moreover I have used JSON.stringify() to print the JSON object.

And I also have modified the way you were building the output JSON object.

var array1 = ["Kolkata", "Begumpet", "Bellary"];

var array2 = [
  [
    [20, "Kolkata1"],
    [10, "Kolkata2c"]
  ],
  [
    [0, "Begumpet1"],
    [10, "Begumpet2e"]
  ],
  [
    [30, "Bellary1"],
    [0, "Bellary2a"]
  ]
];

var resultvalue = [];
for (i = 0; i < array1.length; i++) {
  var result = {};
  var temp = {};
  temp.label = array1[i];
  for (j = 0; j < 2; j++) {
    temp[[array2[i][j][1]]] = array2[i][j][0];
  }
  resultvalue.push(temp);
}

document.write(JSON.stringify(resultvalue));
console.log(resultvalue);

SORRY.... COULDN'T UNDERSTAND THE QUESTION... I UPDATED THE CODE.

Upvotes: 1

trincot
trincot

Reputation: 350270

You could do it with this ES6 code:

var array1 = [ "Kolkata", "Begumpet", "Bellary"];
var array2 = [[[20,"Kolkata1"],[10,"Kolkata2c"]],
              [[0,"Begumpet1"],[10, "Begumpet2e"]],[[30, "Bellary1"],[0, "Bellary2a"]]]

var result = array2.map( (pairs, i) => 
    Object.assign ({ label: array1[i] }, ...pairs.map ( ([v, k]) => ({ [k]: v }))));
 
console.log(result);
.as-console-wrapper { max-height: 100% !important; top: 0; }

Upvotes: 1

kukkuz
kukkuz

Reputation: 42352

Another solution using Array.prototype.reduce and forEach on the inner arrays to get the required array - demo below:

var array1 = [ "Kolkata", "Begumpet", "Bellary"];
var array2 = [[[20,"Kolkata1"],[10,"Kolkata2c"]],[[0,"Begumpet1"],[10, "Begumpet2e"]],[[30, "Bellary1"],[0, "Bellary2a"]]];

var result = array2.reduce(function(p,c,i){
  var elem = {label : array1[i]};
  c.forEach(e => elem[e[1]] = e[0]);
  p.push(elem);
  return p;
},[]);

console.log(result);
.as-console-wrapper{top:0;max-height:100%!important;}

Upvotes: 1

Nina Scholz
Nina Scholz

Reputation: 386620

You could iterate array2 and map a new object for each entry.

var array1 = ["Kolkata", "Begumpet", "Bellary"],
    array2 = [[[20, "Kolkata1"], [10, "Kolkata2c"]], [[0, "Begumpet1"], [10, "Begumpet2e"]], [[30, "Bellary1"], [0, "Bellary2a"]]],
    dataset = array2.map(function (a, i) {
        var o = { label: array1[i] };
        a.forEach(function (b) {
            o[b[1]] = b[0];
        });
        return o;
    });

console.log(dataset);
.as-console-wrapper { max-height: 100% !important; top: 0; }

Upvotes: 2

PMerlet
PMerlet

Reputation: 2594

To convert a javascript object to JSON you have to call the JSON.stringify method.

var jsonString = JSON.stringify(array2);

Upvotes: 0

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