Convert JSON Value from String to Integer in Angular

Question

I have a very large array of JSON objects (about 4000 objects). The value of one of the keys is a string and I want to convert it to an integer so I can iterate the array and pull out the object with the largest value for that key. Here is a sample of the array:

[
  {
    "id": "34567",
    "title": "Some title",
    "likes": "5",
    "comments": "7",
    "views": "3"
  },
  {
    "id": "34568",
    "title": "Some title 2",
    "likes": "4",
    "comments": "7",
    "views": "3"
  },
  {
    "id": "34569",
    "title": "Some title 3",
    "likes": "3",
    "comments": "7",
    "views": "3"
  },
  {
    "id": "34560",
    "title": "Some title 4",
    "likes": "2",
    "comments": "7",
    "views": "3"
  }
]

What I'm trying to do is iterate the array, convert the 'likes' value to an integer and then pull out the object with the largest value for 'likes'.

Did you try to write anything? 4000 isn't that large, and your process seems straightforward. — Eric Duminil
– Eric Duminil, Commented Nov 3, 2016 at 13:03
Try Lodash third party script to handle these kind of scenarios, lodash.com/docs — Sanish Joseph
– Sanish Joseph, Commented Nov 3, 2016 at 13:03
You don't need lodash. Just loop over the object, parseInt the likes property and store the index of the highest like number. — str
– str, Commented Nov 3, 2016 at 13:06
Lodash is just a suggestion, if you want to write less code and more features. I believe .maxBy(array, [iteratee=.identity]) will solve your current issue. Use it only if you have many operations/manipulations to be done on that JSON which is basically a collection of objects. — Sanish Joseph
– Sanish Joseph, Commented Nov 3, 2016 at 13:10

devqon · Accepted Answer · 2016-11-03 13:12:47Z

2

This is just simple javascript, do something like this:

if (myArray.length) {

    var heighest = myArray[0];
    for (var i = 1; i < myArray.length; i++) {
        var likes = parseInt(myArray[i].likes);
        if (likes > heighest.likes) {
            heighest = myArray[i];
        }
    }

    console.log(heighest); // logs object with id 34567
} else {
    console.log("No items in array");
}

edited Nov 3, 2016 at 13:12

answered Nov 3, 2016 at 13:06

devqon

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Abdul Mateen Mohammed · Accepted Answer · 2016-11-03 13:14:54Z

Check this solution. Store the likes value in a temporary variable and replace it if a higher value is found also by replacing the object with the current one.

var items = [{
  "id": "34567",
  "title": "Some title",
  "likes": "5",
  "comments": "7",
  "views": "3"
}, {
  "id": "34568",
  "title": "Some title 2",
  "likes": "4",
  "comments": "7",
  "views": "3"
}, {
  "id": "34569",
  "title": "Some title 3",
  "likes": "3",
  "comments": "7",
  "views": "3"
}, {
  "id": "34560",
  "title": "Some title 4",
  "likes": "2",
  "comments": "7",
  "views": "3"
}];

var best;
var max = 0;
for (var i = 0; i < items.length; i++) {
  var likes = parseInt(items[i].likes);
  if (likes > max) {
    max = likes;
    best = items[i];
  }
}

console.log(best);

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