Loop statements are used to run a program code in a loop which can break or continue subject to certain conditions.
Scala has 3 types of loop statements:
for loop
is using the left-arrow operator. The left-arrow ? operator is called a generator, so named because it's generating individual values from a range.Example 1:
object Hello {
def main(args: Array[String]) {
// Local variable declaration:
var a = 5;
// while loop execution
while( a < 10 ){
a = a + 1;
println( "Value of a: " + a );
}
}
}
Example 2:
object Hello {
def main(args: Array[String]) {
// Local variable declaration:
var a = 5;
// do loop execution
do {
a = a + 1;
println( "Value of a: " + a ); }
while( a < 10 )
}
}
Example 3:
object Hello {
def main(args: Array[String]) {
var a = 0;
// for loop execution with a range
println("Loop 1 - simple loop")
for( a <- 1 to 5){
println( "Value of a: " + a );
}
println("Loop 2 - loop with custom incremental value")
for( a <- 1 to 10 by 2){
println( "Value of a: " + a );
}
println("Loop 3 - loop in reverse, decreasing order")
for( a <- 5 to 1 by -1){
println( "Value of a: " + a );
}
println("Loop 4 - loop using until, one iteration less than simple loop")
for( a <- 5 until 1 by -1){
println( "Value of a: " + a );
}
println("Loop 5 - loop over collections")
val myList = List(1,2,3,4,5);
for( a <- myList ){
println( "Value of a: " + a );
}
println("Loop 6 - loop over multiples ranges, loop within loop")
for( a <- 1 to 5; b <- 1 to 3){
println( "Value of a: " + a );
println( "Value of b: " + b );
}
}
}
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