Dart num isNegative
Syntax & Examples

num.isNegative property

The `isNegative` property in Dart returns true if the number is negative; otherwise, it returns false.

Syntax of num.isNegative

The syntax of num.isNegative property is:

 bool isNegative

This isNegative property of num true if the number is negative; otherwise, false.

Return Type

num.isNegative returns value of type bool.


✐ Examples

1 Check negative number

In this example,

  1. We create a double variable negativeNum with the value -3.8.
  2. We check if the number is negative using the isNegative property.
  3. We then print the result to standard output.

Dart Program

void main() {
  double negativeNum = -3.8;
  bool isNegativeValue = negativeNum.isNegative;
  print('Is $negativeNum negative? $isNegativeValue');
}

Output

Is -3.8 negative? true

2 Check positive number

In this example,

  1. We create a double variable positiveNum with the value 7.0.
  2. We check if the number is negative using the isNegative property.
  3. We then print the result to standard output.

Dart Program

void main() {
  double positiveNum = 7.0;
  bool isNegativeValue = positiveNum.isNegative;
  print('Is $positiveNum negative? $isNegativeValue');
}

Output

Is 7 negative? false

Summary

In this Dart tutorial, we learned about isNegative property of num: the syntax and few working examples with output and detailed explanation for each example.