I can't use .insert to add object into array with Dart

Question

I'm trying to insert an object into array of objects. The idea is just add the content of the object if the object already exist but I don't understand why I can't use the .insert

I have tried using the .insert and adding the object into the array.

void main() {

  var arr = [
    {
      "shelf1": [
        {
          "Entry": "something",
          "Status": "",
          "Account": "",
          "Address": "",
          "Result": null
        }
      ]
    },
    {
      "shelf2": [
        {
          "Entry": "something",
          "Status": "",
          "Account": "",
          "Address": "",
          "Result": null
        }
      ]
    },
    {
      "shelf3": [
        {
          "Entry": "something",
          "Status": "",
          "Account": "",
          "Address": "",
          "Result": null
        }
      ]
    }
  ];

  var object = {
    "shelf1": {
      "Entry": "something2",
      "Status": "",
      "Account": "",
      "Address": "",
      "Result": null
    }
  };

  arr.insert(0, object);

  print(arr);
}

Use splice instead. From: https://stackoverflow.com/questions/586182/how-to-insert-an-item-into-an-array-at-a-specific-index-javascript — Yosef.Schwartz
– Yosef.Schwartz, Commented Dec 8, 2022 at 23:56

Christopher Moore · Accepted Answer · 2022-12-09 00:35:06Z

1

The arr has a type of List<Map<String, Map<String, List<Map<String, String>>>>> and the object you declared has a type of Map<String, Map<String, String>>. This is because using var, the type is automatically inferred based on the assigned value. Since you're trying to add an object of an incorrect type an error is thrown.

So your new object should be made like the following to be inserted normally:

var object = {
  "shelf1": [{         // note that I made this inside a List []
    "Entry": "something2",
    "Status": "",
    "Account": "",
    "Shelf": "shelf",
    "Address": "",
    "Result": null
  }]
};

edited Dec 9, 2022 at 0:35

Christopher Moore

17.3k11 gold badges52 silver badges63 bronze badges

answered Dec 9, 2022 at 0:02

Gwhyyy

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