In Kotlin can I create a range that counts backwards?

Question

I looked at the documentation for the Ranges and I see no mention of backwards ranges.

Is it possible to do something like:

for (n in 100..1) {     println(n) } 

And get results:

100 99 98 ... 

Answer 1

Use downTo as in:

for (n in 100 downTo 1) { // } 

Answer 2

Just as an example of an universal range function for "for":

private infix fun Int.toward(to: Int): IntProgression {     val step = if (this > to) -1 else 1     return IntProgression.fromClosedRange(this, to, step) } 

Usage:

// 0 to 100 for (i in 0 toward 100) {     // Do things }  // 100 downTo 0 for (i in 100 toward 0) {     // Do things }