• The only control structures in Scala are if, while, for, try, match, and function calls.
• Almost all of Scala’s control structures result in some value, as per the functional approch of Scala.

• Scala if-else logic is almost similar with Java

  • Scala if-else statements returns a value, which is different from Java. Examplevar maxoftwo = if(x>y) x else

  • In cases, where else part if not defined in if-else statement, return type would be Any

    /* In below statement 'else' is not defined so the return type would be 'Any' */
    val result = if(a%2) return "even"
    
    /* Return type will be Java.lang.String */
    val result = if(a%2) return "even" else "odd"
    

  • An if statement without an elseis equivalent to if (x > 0) 1 else ()

• Scala looping is almost similar to Java while using whileand do-while

while(condition){ 
    statement(s)
}

do{    
    statement(s)
}while(condition)

• Scala has slightly different approach for looping through for , you can filter (if condition) in for loop.

for(variable <- list) statement

/* OR */
for(variable <- range) statement

/* OR */
for(variable <- [range or list] if condition; if condition; ...) statement

var list = List(1,2,3,4,5,6,7,8,9,10)

/* Print odd number in list except 7 */
for(element <- list if element%2 != 0; if element!= 7) println("Element of list is : " + element)

• you can use "to" or "until"(to exclude upper bound) for iteration with "for".
• match - case use in scala same as switch in other language.
• No break or continue in scala although Class Breaks in package scala.util.control offers a break method.