Question prototypes for Javascript in Coderunner (prompt, random, gapfiller)

Question prototypes for Javascript in Coderunner (prompt, random, gapfiller)

by Matteo Candita -
Number of replies: 1

Hello everyone,

At my school, we are using JavaScript as an introductory programming language, utilizing prompt for input and console.log for output. However, CodeRunner supports Node.js, which does not include the prompt function.

Through various workarounds, I have managed to:

  1. Redirect input from the Standard Input field to work with prompt.
  2. Override Math.random() to always produce the same numbers.
  3. Create a gap-filler question type for JavaScript.

I am sharing these solutions in case they might be useful for others in the future. If the developers find them relevant, they could also be added to the references to assist those searching for similar solutions.

1- Redirect input from the Standard Input field to work with prompt.
Add in the customisation field, before {{ STUDENT_ANSWER }}, the following code:

const inputs = `{{ TEST.stdin }}`.split('\n');
let inputIndex = 0;
global.prompt = () => inputs[inputIndex++];

2- Override Math.random() to always produce the same numbers.

Add in the customisation field, before {{ STUDENT_ANSWER }}, the following code:
const randomValues = [ 0.15, 0.23, 0.52, 0.34, 0.75, 0.38, 0.62, 0.01, 0.29, 0.40, 0.92, 0.54, 0.42, 0.09, 0.10, 0.07, 0.88, 0.46, 0.01, 0.21,  0.17, 0.64, 0.06, 0.57, 0.25, 0.29, 0.81, 0.57, 0.02, 0.62,0.03, 0.38, 0.64, 0.75, 0.22, 0.49, 0.89, 0.92, 0.13, 0.72 ];
let randomIndex = 0;
Math.random = () => randomValues[randomIndex++ % randomValues.length]; 
You can download my XML with the prototype with both prompt and random workaround at this link: https://coderunner.org.nz/pluginfile.php/1564/mod_forum/post/3073/PROTOTYPE_JavascriptWithPromptAndRandom.xml
3- Create a gap-filler question type for JavaScript.
As I was translating the question prototype to English I realized there is still a bug I need to fix. I'll come back to this later with the prototype.

If somebody needs anything, feel free to ask.
Bye!

                        

    
    
    
                            

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                                        In reply to Matteo Candita
                                        
Re: Question prototypes for Javascript in Coderunner (prompt, random, gapfiller)

                                        

                                            by Matteo Candita - 
                        

                                

                            

                
                            

                                        

                                        

                
                                

                                    

                                        This is my Javascript Gapfiller prototype. It was quite tricky, but it seems to be working fine! 

If someone wants to check it out, I'm open to feedback and suggestions:

here is the code I used in the template.




let SEPARATOR = "##";
let code= "{{ QUESTION.globalextra | e('js')}}";//read code with gaps from the globalextra field
let field_values = {{ STUDENT_ANSWER}}; //read the student's answers

const regex = /\{\[.*?\]\}/;//reges to match the {[___]} GAP

for (let field of field_values) {//for each of the student's answer fill the GAP with the value
    code = code.replace(regex, field);
}

let tests = {{ TESTCASES | json_encode }};
for (let test of tests) {//for each test add the test code to be executed BEFORE the actual code.
    let testcode = test['testcode'];
    let finalcode=testcode+"\n"+ code;
    eval(finalcode); //code execution
}
@17943918#@>