Control Flow Statements - statements used in swift

List out what is the control transfer statements used in swift

Control flow statements are used to control the flow of execution in a program. There are several types of control flow statements in Swift, including loop statements, branch statements, and control transfer statements. 

1.       Loop statements allow a block of code to be executed repeatedly

2.        Branch statements allow a certain block of code to be executed only when certain conditions are met

3.       Control transfer statements provide a way to alter the order in which code is executed.

4.       Swift provides a do statement to introduce scope, and catch and handle errors,

5.       Defer statement for running cleanup actions just before the current scope exits.

Loop Statements -

Loop statements allow a block of code to be executed repeatedly, depending on the conditions specified in the loop.

Swift there are three loop statements

·         For-in statement

·         While statement

·         Repeat-while statement

A for-in statement allows a block of code to be executed once for each item in a collection that conforms to the Sequence protocol.

for item in collection {

    statements

}

A while statement allows a block of code to be executed repeatedly, a condition remains true.

while condition {

    statements

}

A repeat-while statement allows a block of code to be executed one or more times, then condition true.

repeat {

    statements

} while

Branch Statements

Branch statements allow a certain block of code to be executed only when certain conditions are met. Swift have three branch statements

·         if statement

·         guard statement

·         Switch statement

Guard Statement

A guard statement is used to transfer program control out of a scope if one or more conditions aren’t met.

guard condition else {

    statements

}

Switch Statement

A switch statement allows certain blocks of code to be executed depending on the value of a control expression.

switch control expression {

case pattern 1:

    statements

case pattern 2 where condition:

    statements

case pattern 3 where condition,

     pattern 4 where condition:

    statements

default:

    statements

}

Control Transfer Statements

Control transfer statements can change (alter) the order in which code in your code is executed.

 Swift have five control transfer statements

·         break statement,

·         continue statement - A continue statement ends program execution of the current iteration of a loop statement 

·         fallthrough statement

·         return statement

·         throw statement