The while Loop

Like in most other languages, the while loop is another looping construct used. The while loop can do any repetitive task until a condition is satisfied. It means that the condition provided has to be true for the code execution to stop. Generic syntax for the while loop is:

while (condition check (if it's true))  
        ... // Block of Code to be executed 

The condition to be checked is going to be a Boolean expression. It gets terminated when the condition is false. One of the ways we can use them is:

scala> val stocks = List("APL", "GOOG", "JLR", "TESLA") 
stocks: List[String] = List(APL, GOOG, JLR, TESLA) 
 
scala> val iteraatorForStocks = stocks.iterator 
iteraatorForStocks: Iterator[String] = non-empty iterator 
 
scala> while(iteraatorForStocks.hasNext) println(iteraatorForStocks.next()) 
APL 
GOOG 
JLR 
TESLA 

We've used our list of stocks with a few stock names. Then we called the iterator method on the list to get an iterator for our sequence. Here iteraatorForStocks of Type Iterator[String] is a non-empty iterator that we can use to iterate over the list. Iterators have hasNext methods to check if there's a component remaining in sequence. Calling next on the iterator gives the resulting element. We've printed by iterating over the elements of our stock list. Let's take a look at do while loops.