Creating a Range of Numbers

In this lesson, you will learn how to create a range of numbers using `Range`.

We'll cover the following

Introduction

In the previous lessons, we used the range method to populate a collection. A Range is also a collection in itself. It is an ordered sequence of integers with the integers being equally spread apart from one another by an equal interval.

Creating a Range Using to

We can create a Range by fixing to between the lower limit and upper limit of a Range.

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val myFirstRange =  1 to 10
// Driver Code
myFirstRange.foreach(println)

The code snippet above creates a range of numbers starting from 1 all the way up to 10.

Specifying an Interval Using by

We can specify the interval between each element using by.

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val oddRange = 1 to 10 by 2
// Driver Code
oddRange.foreach(println)

The code snippet above creates a range of numbers starting from 1 all the way to 10 with an interval of 2 between two numbers. In other words, this would give us all the odd integers from 1 to 10.

Creating a Range Using until

When we want to exclude the upper limit in a Range, we can use until fixed between the lower limit and the excluded upper limit.

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val notLast = 1 until 3
// Driver Code
notLast.foreach(println)

The code snippet above creates a range of numbers starting from 1 until 3. In other words, it’s a range of numbers starting from 1 and ending at 2.

In the next lesson, we will discuss Streams; the last collection covered in this course.