Learn the syntax, data types, and operations essential for programming in Scala

Become a Scala Developer

In this module, we will learn Scala from the ground up. This module aims to teach us how to write basic programs, assuming we have no prior knowledge of the language. We will start with a brief introduction to Scala to understand its functionality and applications. We will then move discuss the key features and functions of the language (data types, functions, classes, etc.) in detail. In the end, we will have all the basic knowledge of how to program in Scala.

Learn Scala from Scratch

## Task

In this challenge, you had to create a nested function `max` which would help its parent function `mainMax` to compute the maximum of three numbers.


## Solution

A skeleton of the `mainMax` function was already provided for you. Let's look it over.

```
def mainMax(a: Int, b: Int, c: Int): Int = {

}
```

`mainMax` takes three parameters of type `int` and returns a value of type `Int`.

Let's go over the step-by-step process for writing the `max` function.

* `max` is intended to break down the bigger problem into a smaller one. While `mainMax` returns the maximum of three numbers, `max` returns the maximum of two of them. This means that it will take two parameters of type `Int` and return the greater of the two. To find the maximum of two numbers, a simple `if-else` expression can be used.

```
def max(x: Int, y: Int) = {
  if(x > y) x
    else y
}
```

* As for the return value of `mainMax`, we simply needed to call the `max` function. The first argument will be one of the three numbers passed to `mainMax` and the second argument will be the maximum of the remaining two. To get the second argument, we will use the `max` function again as it returns the maximum of two numbers.

```
max(a,max(b,c))

```






You can find the complete solution below:

>You were required to write the code from **line 1** to **line 7**.

# Task

In this challenge, you had to create a nested function `max` which would help its parent function `mainMax` to compute the maximum of three numbers.


# Solution

A skeleton of the `mainMax` function was already provided for you. Let's look it over.

```
def mainMax(a: Int, b: Int, c: Int): Int = {

}
```

`mainMax` takes three parameters of type `int` and returns a value of type `Int`.

Let's go over the step-by-step process for writing the `max` function.

* `max` is intended to break down the bigger problem into a smaller one. While `mainMax` returns the maximum of three numbers, `max` returns the maximum of two of them. This means that it will take two parameters of type `Int` and return the greater of the two. To find the maximum of two numbers, a simple `if-else` expression can be used.

```
def max(x: Int, y: Int) = {
  if(x > y) x
    else y
}
```

* As for the return value of `mainMax`, we simply needed to call the `max` function. The first argument will be one of the three numbers passed to `mainMax` and the second argument will be the maximum of the remaining two. To get the second argument, we will use the `max` function again as it returns the maximum of two numbers.

```
max(a,max(b,c))

```






You can find the complete solution below:

>You were required to write the code from **line 1** to **line 7**.

In the following lesson, we will go over the solution of the challenge:  Max with Nested Functions.

Getting to Know Scala

Variables and Types

Operating with Operators

Strings and How to Use Them

Scala's Collection Library

Control Structures

Getting Started with Functions

Higher-Order Functions

Classes and Objects

Conclusion

Solution Review: Max with Nested Functions

Task

Solution