Boolean

A Boolean type is declared with the bool keyword and can only take the values true or false. We use Booleans in programming to make comparisons and to control the flow of the program.

Example:

bool isReady = false;

Before giving examples with operators, we must learn the String Interpolation that gives us the ability to embed expressions within normal strings, you would use the following syntax:

void main(){

var name = "Aziz";

var age = 20;

print("I am ${name} I am ${age} years old");

}

I am Aziz I am 20 years old

Comparison Operators:

void main() {

var x = 10;

var y = 15;

print("x == y: ${x == y}");

print("x != y: ${x != y}");

print("x < y: ${x < y}");

print("x > y: ${x > y}");

print("x <= y ${x <= y}:");

print("x >= y ${x >= y}:");

}

x == y : false
x != y : true
x < y : true
x > y : false
x <= y : true
x >= y : false

Logical Operators:

void main() {

print((9 > 7) && (2 < 4));

print((8 == 8) || (6 != 6));

print(!(3 <= 1));

}

true
true
true

== Truth Table

x	==	y	Returns
true	==	true	true
true	==	false	false
false	==	true	false
false	==	false	true

AND Truth Table

x	&&	y	Returns
true	&&	true	true
true	&&	false	false
false	&&	true	false
false	&&	false	false

OR Truth Table

x	\|\|	y	Returns
true	\|\|	true	true
true	\|\|	false	true
false	\|\|	true	true
false	\|\|	false	false

NOT Truth Table

!	x	Returns
!	true	false
!	false	true