Conditional execution — if statement

Lesson#10

Conditional execution means execution of block of statement is based on a condition. If a condition comes true then certain statements are executed. It is achieved in dart with the help of if statement and switch statements.

Syntax of if statement is:

if (condition) 
  statement1;
[else
  statement2;]

Note that brackets in the syntax means optional part.

Condition is a logical expression (that returns either true or false). If condition is true then statement1 is executed otherwise statement2 is executed.

Example:

void main() {
  var num = 5;
  if (num < 10) 
    print("Less than 10!");
}
// Prints "Less than 10!" on screen

Relational operators in dart are <, >, ==, !=, <=, >=

Multiple conditions can be combined using the logical operators. Logical operators in dart are && (for AND), || (for OR), and ! (for NOT).