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 ) ) {
            this.addNotification({
                title: 'Correct.',
                message: 'Your answer is correct!',
                level: 'success',
                position: 'tr'
            });
        } else {
            this.addNotification({
                title: 'Incorrect.',
                message: 'Your answer is incorrect!',
                level: 'warning',
                position: 'tr'
            });            
        }
    }}
/>

The addNotification method of the lesson comes from the react-notification-system.

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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