In Dart, How to access the element from the array which is created like below?

final Object? elements;    
elements= ["element1" , "element2" , "element3"];

CodePudding user response：

First, no need to declare the type:

final elements = ["element1" , "element2" , "element3"];

The compiler can determine the type: List<String>

To access the first element of the array (usually called List in Dart):

elements.first // same as elements[0]

To access the last element of the array:

elements.last // same as elements[elements.length - 1]

To access the nth element of the array (where 0 is the first index):

elements[n]

CodePudding user response：

convertObject(Object obj) {
  if (obj is bool) {
    return obj;
  } else if (obj is List) {
    print("ListType");
    return obj.map((e) => e.toString()).toList(); // creating list by converting string
  }
  ///... do for others

}


void main(List<String> args) {
  final Object? elements;
  elements = ["element1", "element2", "element3"];

  final convertedDB = convertObject(elements);
  print(convertedDB);
  print("0 index item ${convertedDB[0]}");
}

Everything you can place in a variable is an object, and every object is an instance of a class. Even numbers, functions, and null are objects. With the exception of null (if you enable sound null safety), all objects inherit from the Object class.

More about static-checking

built-in-types

Lists (List, also known as arrays)