Loops

[kengorab]

I should be able to loop, either over a range of data or until a certain condition is no longer true.

var a = 0
while a < 3 {
  a = a + 1
}
a  // 2

var greeting = "He"
for ch in ["l", "l", "o"] {
  greeting = greeting + ch
}

// This would also produce the same effect, since strings should be considered iterable:
for ch in "llo" { .. }

// Also, to obtain the index there is an optional second parameter
for ch, idx in ["l", "l", "o"] {
  println("Index: " + idx)
  greeting = greeting + ch
}

// The `range` builtin can also be used to iterate over ranges
var sum = 0
for i in range(0, 10) {
  sum = sum + i
}

Loops can also be infinite-loops, meaning that they will continue to loop until a break keyword is met

var a = 0
while a < 3 {
  a = a - 1  // a will always be less than 3, so infinite loop occurs
  if a == -100 {
    break
  }
}