TypeConversion

Type Conversion in Dart

Type conversion allows us to convert one data type to another type. For example, We can convert from String to int, int to String, or String to bool, and so on.

Convert String to Int in Dart

To convert a String to an int in Dart, you can use the int.parse() method. This method takes a String as an argument and converts it into an integer.

void main() {
  String strValue = "1";
  print("Type of strValue is ${strValue.runtimeType}");
  int intValue = int.parse(strValue);
  print("Value of intValue is $intValue");
  // This will print the data type of intValue
  print("Type of intValue is ${intValue.runtimeType}");
}

Convert String to Double in Dart

To convert a String to a double in Dart, you can use the double.parse() method. This method takes a String as an argument and converts it into a double.

void main() {
  String strValue = "3.14";
  print("Type of strValue is ${strValue.runtimeType}");
  double doubleValue = double.parse(strValue);
  print("Value of doubleValue is $doubleValue");
  // This will print the data type of doubleValue
  print("Type of doubleValue is ${doubleValue.runtimeType}");
}

Convert int to String in Dart

In Dart, you can convert an int to a String by using the toString() method or by using string interpolation to implicitly convert it within a string.

Using toString()

void main() {
  int intValue = 42;
  print("Type of intValue is ${intValue.runtimeType}");
  
  // Using toString() method to convert int to String
  String strValue = intValue.toString();
  
  print("Value of strValue is $strValue");
  // This will print the data type of strValue
  print("Type of strValue is ${strValue.runtimeType}");
}

In the example above, we have an int variable intValue with the value 42. We then use the toString() method to convert it into a String, which is stored in the strValue variable.

Using String Interpolation

void main() {
  int intValue = 42;
  print("Type of intValue is ${intValue.runtimeType}");
  
  // Using string interpolation to implicitly convert int to String
  String strValue = "$intValue";
  
  print("Value of strValue is $strValue");
  // This will print the data type of strValue
  print("Type of strValue is ${strValue.runtimeType}");
}

In this example, we also have an int variable intValue with the value 42. We use string interpolation by enclosing intValue within double quotes ("$intValue") to implicitly convert it into a String, which is stored in the strValue variable.

Both approaches result in converting the int to a String. You can choose the one that suits your coding style and needs.

The code examples above will output:

Type of intValue is int
Value of strValue is 42
Type of strValue is String