While And Do-While Loop

while loops run some code while a certain condition is true. do while loops run an action at LEAST once, and then continue to loop if a certain condtion is true.

you can use a while loop to do something as long as a condition is met

var score = 0
while score < 10 {

     println("The score is less than 10)
     score++
}

the above loop will continue to print out "the score is less than 10" for as long as the score is less than 10. since it starts at 0 and we increment it every time, the loop will stop running once the score hits 10.

a do while loop is used when you need the loop to run at least once.

// it will print at least once time, even if x is not equal to 10
do {
  println(x)
} while (x == 10)

the while loop is much more common than the do while loop in my experience. but even then you dont really use a while loop that much. the for in loop is probably the one that gets used most