Dart Conditional Operators

The following table includes some conditional operators that help in the control flow of the Dart program:

Example: In the following code, you will test the role of double equal sign "= =" whichis used to compare if two values are equal or not. If they are equal, then the run result will be true; otherwise, the run result will be false.

main() {

  int x=3;

  int y=5;

  print(x==y); 

  }

The run result of this code follows:

Example:
The following Dart conditional operator "?" will return one expression (exp1 or exp2) as illustrated in the following figure :

The following code has an example about using "?" Dart conditional operator:

main() {

  var Age=20;

  var x=Age >18 ? "Allow" : "Deny";

  print(x);

  }

Because the "Age" value in this example is 20, the condition result is true, so the run result will be Allow as illustrated in the following figure:

Example:
In the following example, the conditional operator "??" is used to compare two expressions, and then return the value of the expression which is not equal to a null value as illustrated in the following code:

main() {

 var x=null;

 var y=10;

 var z=x ?? y ;

 print(z);

  }

The run result of this code follows:

Example:
The following code displays using "is" operator. If the condition operator result is true, the output will be true; otherwise, the result will be false.

main() {

 int x=5;
 print(x is bool);

  }

The run result of this code follows:

* This topic is a part of lesson 2 of Flutter Application Development course. For more information about this course, click here.