Swift Basic Tutorial 2nd loop and Control structure

• Process Control

1 counting loops within a specific range, structure for

for loopVar in startNumber ... endNumber
 The keyword in is followed by a starting number, three periods, and an ending number, for example:

var loopCount: Int = 0
for loopCount in 1 ... 10 {
print ("# \ (loopCount)")
}
 2 variant syntax

for loopCount in 1 .. <10 {
// print
}
 3 old fashioned for loop

for loopCount = 0; loopCount <10; loopCount ++) {
// do something
}
 Get started with playground

Process control is decision

if (true / false) {
// do sth
} else
{
// do other thing
}
 swift comparison operator

==,! =,>, <,> =, <=
 

if true / false {
// do sth1
} else if true / false {
// do sth2
} else if true / false {
// do sth3
} else {
// do oter thing
}
 switch case default is similar to C, but it is not limited to integer numbers and enums. It can also be used for String. In addition, switch-case does not require break in Swift

for three in threeArray {
  switch three {
    case "Cak":
      print ("Furniture")
    case "Pecan":
      print ("Pie")
     case "Maple":
       print ("Syrup")
    default:
       print ("Wood")
 }
}
while loop

while someCondition {
// do sth
}


repeat {
// do sth
} while someCondition
 Break out of the loop using break

// Todo. Why is there no continue in swift, if it just exits the current loop?

 

"Swift Basic Tutorial 2nd" Loops and Control Structures