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

A function is treated like a basic data value such as an integer.

What does it mean for a function to be treated as a first-class value?

What does it mean for a function to be treated as a first-class value?

```
def func1(f: Int => Int, x: Int) = {
  print(f(x))
}
```

```
def func2(f: Int => Int, x: Int) = {
  print(f)
}
```

```
def func3(x: Int, f: Int => Int) = {
  print(f(x))
}
```

```
def func4(f: (Int,Int) => Int, x: Int, y: Int) = {
  print(f(x,y))
}
```

The code snippets below are using functions as function parameters. Which of the following will result in a syntax error?

The code snippets below are using functions as function parameters. Which of the following will result in a syntax error?

The code snippets below are anonymous functions which return the product of two numbers. Which of the following are the incorrect implementation?

The code snippets below are anonymous functions which return the product of two numbers. Which of the following are the incorrect implementation?

Syntax that makes code easier to read and express

Syntax which changes the functionality of the code

It's just a cool way of saying *'sweet syntax!'*

What is syntactic sugar?

Anonymous functions are syntatic sugar because they don't bring any change to the expressive power of Scala.

Anonymous functions are syntatic sugar because they don’t bring any change to the expressive power of Scala.

The function `saySomething`, returns an anonymous function. What will be the output of the following code?

```
def saySomething(prefix: String) = (s: String) => {
  prefix + " " + s
}

def saySomethingElse = saySomething("hello")

print(saySomethingElse("there"))
```

The function <code>saySomething</code>, returns an anonymous function. What will be the output of the following code?
<pre><code>def saySomething(prefix: String) = (s: String) =&gt; {
 prefix + &quot; &quot; + s
}

def saySomethingElse = saySomething(&quot;hello&quot;)

print(saySomethingElse(&quot;there&quot;))
</code></pre>

A way of writing functions with multiple parameter lists

`add` is a curried function. What will be the output of the following code?

```
def add(a: Int)(b: Int) = a + b

val first = add(1)(5) 

val second = add(4)_ 

val third = second(2) 

print(first == third) 
```

<code>add</code> is a curried function. What will be the output of the following code?
<pre><code>def add(a: Int)(b: Int) = a + b

val first = add(1)(5) 

val second = add(4)_ 

val third = second(2) 

print(first == third) 
</code></pre>

In the next chapter, we will move on to **classes** and **objects**.

In the following quiz, you will be tested on concepts you learned in this chapter.

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

Chapter Quiz