Example 1: Check if Int Array contains a given value
fun main(args: Array<String>) {
val num = intArrayOf(1, 2, 3, 4, 5)
val toFind = 3
var found = false
for (n in num) {
if (n == toFind) {
found = true
break
}
}
if (found)
println("$toFind is found.")
else
println("$toFind is not found.")
}
When you run the program, the output will be:
3 is found.
In the above program, we have an array of integers stored in variable num. Likewise, the number to be found is stored in toFind.
Now, we use a for-in
loop to iterate through all elements of num and check individually if toFind is equal to n or not.
If yes, we set found to true
and break from the loop. If not, we move to the next iteration.
Example 2: Check if array contains given value using Stream
import java.util.stream.IntStream
fun main(args: Array<String>) {
val num = intArrayOf(1, 2, 3, 4, 5)
val toFind = 7
val found = IntStream.of(*num).anyMatch { n -> n == toFind }
if (found)
println("$toFind is found.")
else
println("$toFind is not found.")
}
When you run the program, the output will be:
7 is not found.
In the above program, instead of using a foreach loop, we convert the array to an IntStream
and use its anyMatch()
method.
anyMatch()
method takes a predicate, an expression or a function which returns a boolean value. In our case, the predicate compares each element n in the stream to toFind and returns true
or false
.
If any of the element n returns true
, found is set to true
as well.
Example 3: Check if array contains a given value for non-primitive types
import java.util.Arrays
fun main(args: Array<String>) {
val strings = arrayOf("One", "Two", "Three", "Four", "Five")
val toFind = "Four"
val found = Arrays.stream(strings).anyMatch { t -> t == toFind }
if (found)
println("$toFind is found.")
else
println("$toFind is not found.")
}
When you run the program, the output will be:
Four is found.
In the above program, we've used a non-primitive data type String
and used Arrays
's stream()
method to first convert it to a stream and anyMatch()
to check if array contains the given value toFind.
Here's the equivalent Java code: Java program to check if array contains a given value.