Scala downwards or decreasing for loop?
scala> 10 to 1 by -1
res1: scala.collection.immutable.Range = Range(10, 9, 8, 7, 6, 5, 4, 3, 2, 1)
Scala provides many ways to work on downwards in loop.
1st Solution: with "to" and "by"
//It will print 10 to 0. Here by -1 means it will decremented by -1.
for(i <- 10 to 0 by -1){
println(i)
}
2nd Solution: With "to" and "reverse"
for(i <- (0 to 10).reverse){
println(i)
}
3rd Solution: with "to" only
//Here (0,-1) means the loop will execute till value 0 and decremented by -1.
for(i <- 10 to (0,-1)){
println(i)
}
The answer from @Randall is good as gold, but for sake of completion I wanted to add a couple of variations:
scala> for (i <- (1 to 10).reverse) {code} //Will count in reverse.
scala> for (i <- 10 to(1,-1)) {code} //Same as with "by", just uglier.