Dart Equality and Relational Operators

Dart provides the functionality of checking the relationship between the values or values within the variables.

These operators return the resultant value as Boolean, i.e., either ‘true’ or ‘false’.

Some important points to remember

1. All these equality and relational operators are binary operators.
2. The general structure of these equality and relational operator is similar to other binary operators :

                         Operand operator Operand
         Operands refer to the values and Operator is the symbol that instructs the             compiler about the function to be performed on the operands.

3. In the case of strings, they are said to be equal only if these two strings contain the same character sequence.

List of Equality and Relational Operator

Let us consider the following table that contains the list of all the equality and relational operators in Dart.

For the following table, Consider A = 35, and B = 20

Operator	Operator Name	Operator Description	Example
>	Greater than	This operator checks which operand is bigger and gives the result as a Boolean expression.	( A > B ) will return False
<	Lesser than	This operator checks which operand is smaller and gives the result as a Boolean expression.	( A < B ) will return True
>=	Greater than or equal to	This operator checks which operand is greater or equal to each other and gives the result as a Boolean expression.	( A >= B ) will return False
<=	Lesser than or equal to	This operator checks which operand is less than or equal to each other and gives the result as a Boolean expression.	( A <= B ) will return True
==	Equality	This operator checks whether the operands are equal to each other or not and gives the result as a Boolean expression.	( A == B ) will return False
!=	Not equal	This operator checks whether the operands are not equal to each other or not and gives the result as a Boolean expression.	( A != B ) will return True

Consider the following code in the Dart language that explains the concept of Equality and Relational Operator

Program

void main( )

{

  int a = 25, b = 30 ;




  // Greater than Relational Operator

  var res1 = a > b ;

  print( ' \n Is a greater than b ? ' ) ;

  print ( res1 ) ;




  // Lesser than Relational Operator

  var res2 = a < b ;

  print( ' \n Is a lesser than b ? ' ) ;

  print ( res2 ) ;




  // Greater than or equal to Relational Operator

  var res3 = a >= b ;

  print( ' \n Is a greater than equal to b ? ' ) ;

  print ( res3 ) ;




  // Lesser than or equal to Relational Operator

  var res4 = a <= b ;

  print( ' \n Is a lesser than equal to b ? ' ) ;

  print ( res4 ) ;




  // Equal to Operator

  var res5 = a == b ;

  print( ' \n Is a equal to b ? ' ) ;

  print ( res5 ) ;




  // Not equal to Operator

  var res6 = a != b ;

  print( ' \n Is a not equal to b ? ' ) ;

  print ( res6 ) ;

}

Output

Is a greater than b ?

 false


 Is a lesser than b ?

 true


 Is a greater than equal to b ?

 false


 Is a lesser than equal to b ?

 true


 Is a equal to b?

 false


 Is a not equal to b ?

 true