I can't assign array to string variable in flutter

August 4, 2022

 for (i = 0; i < arr1.length - 1; i++) {
  msg += arr1[i] + ",";
}
msg += arr1[i];

I want to throw the data from the above array into a string variable named msg with a comma between them. But I am getting an error as below. How can I fix.

_TypeError (type ‘String’ is not a subtype of type ‘num’ of ‘other’)

>Solution :

It depends of what type of data is store in the array. If integers, or whatever else, you need to tranform to a string, with the toString() method

So:

msg += arr1[i].tostring() + ",";

If mixed types, you can check type with something like this:

if (arr1[i] is int) {
  msg += arr1[i].tostring() + ",";
}

if (arr1[i] is bool) {
  if (arr1[i]) { 
    msg += "1,";
  } else {
    msg += "0,";
}
 // And so on...