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Introduction to Dart
course content

Course Content

Introduction to Dart

Introduction to Dart

1. First Acquaintance with Dart
About DartFirst ApplicationFunction print()CommentsBasic Math Operations
2. Variables and Data Types
Data TypesVariablesProperties of NumbersBool, Equality and Relational Operators
3. Conditional Statements
if Statementif...else Statementelse-if Statementswitch-sase Statement
4. List and String
ListIndexesStringWhat are Methods?String Properties and Methods
5. Loops
Introduction to Loopswhile-LoopsDo-whilefor-LoopsIncrement and DecrementBreak and Continue

bookIndexes

About Indexes

Every element in the List, or String, has a unique address. Such addresses are called indexes:

Indexes start from 0. The first element is assigned the index 0, the second element is assigned the index 1, and so on.

We can retrieve an element from the list using its index with the following syntax:

Example

Let's print the element at index 1 from the List:

dart

main

copy

              
1234

            
void main() {
  List<String> names = ["Bob", "John"];
  print(names[1]); // John 
}

Editing

Dart allows modifying the value of an item in a List. In other words, one can re-write the value of a List item.

dart

main

copy

              
12345

            
void main() {
  List cars = ["BMW", "Porsche", "Ford"];
  cars[0] = "Toyota";
  print (cars); // ["Toyota", "Porsche", "Ford"]
}

The above example updates the value of the List item with index 0. The output of the code will be − [‘Toyota’, ‘Porsche’, ‘Ford’]

String Indexes

In a String, we also have indexes.

dart

main

copy

              
1234

            
void main() {
  String  user = "Alex";
  print(user[0]);
}

Note

The only difference between Indexes in a String and Indexes in a List is that in Lists, we can update values at those addresses, whereas in Strings, we cannot.

Task

Select the element at index 1 in the string 'Codefinity'.

Select the element at index 1 in the string 'Codefinity'.

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 4. Chapter 2
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