Swift - If... Else Statement

An if statement can be followed by an optional else statement, which executes when the Boolean expression is false.

Syntax

The syntax of an if...else statement in Swift is as follows −

if boolean_expression {
   /* statement(s) will execute if the boolean expression is true */
} else {
   /* statement(s) will execute if the boolean expression is false */
}

If the Boolean expression evaluates to true, then the if block of code will be executed, otherwise else block of code will be executed.

Flow Diagram

Example

var varA:Int = 100;

/* Check the boolean condition using if statement */
if varA < 20 {
   /* If condition is true then print the following */
   println("varA is less than 20");
} else {
   /* If condition is false then print the following */
   println("varA is not less than 20");
}

println("Value of variable varA is \(varA)");

When the above code is compiled and executed, it produces the following result −

varA is not less than 20
Value of variable varA is 100