When we want to execute a group of statements to perform a task a hundred times, we don’t type them a hundred times. … A function is a callable unit of code that can take a single parameter, a list of parameters, or no parameters at all. Function name can have characters like ++,+,-,– etc. All operations on lists can be expressed in terms of the following three methods. Keep in mind the return type and parameter list or signature of the function while working with them. will call List(1,2,3).map(x => doubleValue(x)) and gives us a list with values (1, 4… Here's a simple example showing how to use the foreach function to print every item in a List: This next example shows a way to sum all the elements in a list using the foreach method: The Scala for expression is not specific to lists, but is an extremely powerful way to operate on lists. Here's the Lisp-style approach to creating a List: Here's the Java-style approach to creating a Scala List: If you're mixing types in a List constructor, you may need to manually specify the List type. Please mail your requirement at hr@javatpoint.com. First, doubling every item in a List: Here's a slightly simpler version of that map example, using the Scala wildcard character (_) instead of a fake variable name: Here's an example using a list of strings: A very nice example in the book Beginning Scala demonstrates how to convert a List into something useful in the HTML world, a list of
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