In Scala, the until keyword is used to iterate over a range of values until a certain condition is met. It is similar to the to keyword in Scala, with the only difference being that the endpoint value is excluded from the range. Here are some examples of how to use until in Scala:
Example 1: Iterate from 0 until 5
for (i <- 0 until 5) {
println(s"Value of i: $i")
}
Output:
Value of i: 0
Value of i: 1
Value of i: 2
Value of i: 3
Value of i: 4
In this example, the loop iterates over a range of values from 0 until 5 (exclusive) using the until keyword.
Example 2: Calculate the sum of all even numbers between 1 and 10
var sum = 0
for (i <- 1 until 10; if i % 2 == 0) {
sum += i
}
println(s"Sum of even numbers between 1 and 10: $sum")
Output:
Sum of even numbers between 1 and 10: 20
In this example, the for loop iterates over a range of values from 1 until 10 (exclusive). The if statement inside the loop checks if each value is even. If the value is even, it is added to the sum variable. Finally, the sum is printed to the console.
Example 3: Iterate over a string until a certain character is found
val message = "Hello, world!"
for (c <- message until ',') {
println(c)
}
Output:
H
e
l
l
o
In this example, the for loop iterates over each character in the message string until the , character is found (exclusive). The println statement prints each character to the console.