How do you call a function in Scala?

Scala Function Parameter example with default value

1. object MainObject {
2. def main(args: Array[String]) = {
3. var result1 = functionExample(15,2) // Calling with two values.
4. var result2 = functionExample(15) // Calling with one value.
5. var result3 = functionExample() // Calling without any value.

How do I print a function in Scala?

The print() method in Scala is just like print() one, but the method of the passing string is a bit different. For example, var rlno = 324; print(“Roll Number = ” + rlno); The output will be the same as it was with printf().

How do you pass a function in Scala?

Summary

1. One function can be passed to another function as a function argument (i.e., a function input parameter).
2. The definition of the function that can be passed in as defined with syntax that looks like this: “f: Int > Int” , or this: “callback: () > Unit” .

What is call by name in Scala?

In Scala when arguments pass through call-by-value function it compute the passed-in expression’s or arguments value once before calling the function . But a call-by-Name function in Scala calls the expression and recompute the passed-in expression’s value every time it get accessed inside the function.

How do I create a function in Scala?

To define a function in Scala, you need to use the keyword def. Then add the name of your function which in our case will be favoriteDonut followed by an empty pair of parenthesis (). To specify the return type you need to use the colon : followed by the return type which in our case is a String.

What is difference between function and method in Scala?

Scala functions are first class values. Difference between Scala Functions & Methods: Function is a object which can be stored in a variable. But a method always belongs to a class which has a name, signature bytecode etc. Basically, you can say a method is a function which is a member of some object.

How do I display Val in Scala?

The variable is declared with the following syntax in Scala as follows: val or val variable_name: variable_datatype = value; In the above syntax, the variable can be defined in one of two ways by using either the ‘var’ or ‘val’ keyword. It consists of ‘variable_name’ as your new variable, followed by a colon.

What is a Val in Scala?

In Scala, ‘val’ modifier is used to define constants. val means constant or immutable that means we cannot change it’s value once its created.

What is pass name?

Pass by name : This technique is used in programming language such as Algol. In this technique, symbolic “name” of a variable is passed, which allows it both to be accessed and update. Example: To double the value of C[j], you can pass its name (not its value) into the following procedure.

Is Scala call by reference?

4 Answers. Java and Scala both use call by value exclusively, except that the value is either a primitive or a pointer to an object. If your object contains mutable fields, then there is very little substantive difference between this and call by reference.