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for loop

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Print numbers from 1 to 10:

for (i <- 1 to 10) println(i)    // 1, ..., 10

If you use "until", the upper bound is excluded:

for (i <- 1 until 10) println(i)    // 1, ..., 9

for can traverse lots of things. If you go through a string, you access it char by char:

for (c <- "scala") print(c + " ")    // s c a l a

Go throught the indices of a string and access the a char by index:

val s = "scala"

for (i <- s.indices) print(s(i) + " ")    // s c a l a

// s.indices gives Range(0, 1, 2, 3, 4)