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Building a first ISLE lesson

Let us start creating a little ISLE lesson. We can use Markdown to simplify writing of text segments.

Below the preamble, we will insert a header and a little description:

# Examples
This lesson will contain some examples
of interactive *ISLE* components.

Let's now look at the R Shell component, which allows the evaluation of R code.

## RShell
<RShell />

Try out evaluating some R code in the life preview. ISLE components have each a variety of attributes, which can be controlled and govern their functionality and appearance. We can set the default code and the number of lines for the R shell as follows:

<RShell code="# Insert default code here..." lines={4} />

Let us now use the R Shell to create a little exercise:

### Create 100 random draws from a Uniform(0,1) distribution
<RShell
hints={["Use the runif function"]}
solution="runif(100)"
/>

When adding solution or hints, new buttons appear on the R Shell, which allow users to access the hints and compare their answers to the supplied solutions.

Let's now intercept the answer of the learner and provide a notification in case it is correct.

### Create 100 random draws from a Uniform(0,1) distribution
<RShell
hints={[
'Use the runif function'
]}
solution="runif(100)"
onEvaluate={( str ) => {
if ( /runif\(100/.test( str ) ) {
session.addNotification({
title: 'Correct.',
message: 'Your answer is correct!',
level: 'success',
position: 'tr'
});
} else {
session.addNotification({
title: 'Incorrect.',
message: 'Your answer is incorrect!',
level: 'warning',
position: 'tr'
});
}
}}
/>

The addNotification method attached to the session object comes from the react-notification-system library and supports all its options.

There are many other ISLE components to use. The ISLE Components section of the documentation contains examples for all of them along with detailed descriptions of their APIs.

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