break & continue

break and continue give you finer control over loops.

break

Exits the loop immediately. Execution continues after the loop:

let i = 0
while true {
  if i >= 10 {
    break
  }
  i += 1
}
print("Stopped at " + str(i))

Searching for something

let numbers = [4, 8, 15, 16, 23, 42]
let found = false
for n in numbers {
  if n > 20 {
    found = true
    break
  }
}

if found {
  print("Found a number greater than 20!")
} else {
  print("No number greater than 20.")
}

continue

Skips the rest of the current iteration and jumps to the next one:

for i in range(10) {
  if i % 2 == 0 {
    continue
  }
  print(str(i))    // 1, 3, 5, 7, 9
}

Filter and process

let words = ["hello", "", "world", "", "bop"]
for word in words {
  if word == "" {
    continue
  }
  print(word.upper())
}

Which loops support break and continue?

All three loop types — while, for...in, and repeat — support both break and continue.

repeat 10 {
  let n = rand(100)
  if n < 10 {
    break
  }
  print(str(n))
}

Note: break and continue only affect the innermost loop. If you have nested loops and want to exit the outer one, use a variable flag or a function with return.