Swift - For Loop

A for loop is a repetition control structure that allows you to efficiently write a loop that needs to execute a specific number of times.

Syntax

The syntax of for loop in Swift programming language is as follows −

for init; condition; increment {
   statement(s)
}

The flow of control in a for loop is as follows −

• The init step is executed first, and only once. This step allows you to declare and initialize any loop control variables. You are not required to put a statement here, as long as a semicolon appears.

• Next, the condition is evaluated. If it is true, the body of the loop is executed. If it is false, the body of the loop does not execute and flow of control jumps to the next statement just after the for loop.

• After the body of the for loop executes, the flow of control jumps back up to the increment statement. This statement allows you to update any loop control variables. This statement can be left blank, as long as a semicolon appears after the condition.

• The condition is now evaluated again. If it is true, the loop executes and the process repeats itself (body of loop, then increment step, and then again condition). After the condition becomes false, the for loop terminates.

Flow Diagram

Example

import Cocoa

var someInts:[Int] = [10, 20, 30]

for var index = 0; index < 3; ++index {
   println( "Value of someInts[\(index)] is \(someInts[index])")
}

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

Value of someInts[0] is 10
Value of someInts[1] is 20
Value of someInts[2] is 30