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 were provided an array of numbers which needed to be squared.


## Solution

Let's go over the solution step-by-step.

* The first thing you had to figure out is that this problem requires a `for` expression.

* Next, you had to figure out the number of iterations required for the program to return the correct output.
As each element of the array needed to be squared, the number of times the `for` expression should run is equivalent to the [length of the array](https://www.educative.io/courses/learn-scala/the-array-collection). 
```
for (i <- 0 until testArray.length)
```
>To create our range for the iterator `i` we use the `Range` keyword `until`. This is because the last index of an array is one less than its length as indexes start from **0** and length starts from **1**. As we already know from a previous [lesson](https://www.educative.io/courses/learn-scala/creating-a-range-of-numbers), `until` excludes the upper limit.



* Finally, the last step required you to assign the square of the value at an index to the same index.

```
testArray(i) = testArray(i)*testArray(i)
```


You can find the complete solution below:

>You were required to write the code from **line 3** to **line 5**.

# Task

In this challenge, you were provided an array of numbers which needed to be squared.


# Solution

Let's go over the solution step-by-step.

* The first thing you had to figure out is that this problem requires a `for` expression.

* Next, you had to figure out the number of iterations required for the program to return the correct output.
As each element of the array needed to be squared, the number of times the `for` expression should run is equivalent to the [length of the array](https://www.educative.io/courses/learn-scala/the-array-collection). 
```
for (i <- 0 until testArray.length)
```
>To create our range for the iterator `i` we use the `Range` keyword `until`. This is because the last index of an array is one less than its length as indexes start from **0** and length starts from **1**. As we already know from a previous [lesson](https://www.educative.io/courses/learn-scala/creating-a-range-of-numbers), `until` excludes the upper limit.



* Finally, the last step required you to assign the square of the value at an index to the same index.

```
testArray(i) = testArray(i)*testArray(i)
```


You can find the complete solution below:

>You were required to write the code from **line 3** to **line 5**.

In the following lesson, we will go over the solution of the challenge:  Array of Squares.

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: Array of Squares

Task

Solution