Dart double toInt()
Syntax & Examples

double.toInt() method

The `toInt` method is used to truncate a `num` (number) to an integer and returns the result as an `int` (integer). It is commonly used when you need to convert a floating-point number to a whole number, discarding the decimal part.

Syntax of double.toInt()

The syntax of double.toInt() method is:

 int toInt()

This toInt() method of double truncates this num to an integer and returns the result as an int.

Return Type

double.toInt() returns value of type int.


✐ Examples

1 Truncate a Double to Integer

In this example,

  1. We declare a double variable num with the value 3.14.
  2. We use the toInt() method to truncate the double to an integer, stored in integerNum.
  3. We print the truncated integer to standard output.

Dart Program

void main() {
  double num = 3.14;
  int integerNum = num.toInt();
  print('Truncated value of $num to int: $integerNum');
}

Output

Truncated value of 3.14 to int: 3

2 Truncate a List of Doubles to Integers

In this example,

  1. We create a list of doubles numbers with values [1.2, 3.4, 5.6].
  2. We use map() with toInt() to truncate each double to an integer in integerList.
  3. We print the truncated list of integers to standard output.

Dart Program

void main() {
  List<double> numbers = [1.2, 3.4, 5.6];
  List<int> integerList = numbers.map((num) => num.toInt()).toList();
  print('Truncated list of numbers: $integerList');
}

Output

Truncated list of numbers: [1, 3, 5]

3 Truncate List of Strings' Lengths to Integers

In this example,

  1. We create a list of strings strings with values ['apple', 'banana', 'cherry'].
  2. We use map() with length.toInt() to truncate each string's length to an integer in stringLengths.
  3. We print the lengths of strings as integers to standard output.

Dart Program

void main() {
  List<String> strings = ['apple', 'banana', 'cherry'];
  List<int> stringLengths = strings.map((str) => str.length.toInt()).toList();
  print('Lengths of strings: $stringLengths');
}

Output

Lengths of strings: [5, 6, 6]

Summary

In this Dart tutorial, we learned about toInt() method of double: the syntax and few working examples with output and detailed explanation for each example.