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HTML

              
                
              
            
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CSS

              
                
              
            
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JS

              
                /**
 * Check parameter 
 * Method returns an object with status and response
 * If status:false the response contains all checks and their details
 * If status:true the response contains the generated <li> HTML
 */

const parameter = {
  /** Get final result for all checks. true if there were errors (one status value is false) */
  status: function status(arrCheck){
    return arrCheck.map(obj => Object.values(obj).map(objCheckValue => objCheckValue.status).includes(false)).includes(true);
  },
  /** Check parameters */ 
  check: function check(val,type){
 
    let boolStatus;
    switch(type){
        /** array? */
      case 'typeArray':
        boolStatus = (Array.isArray(val));  
        return {
          status: boolStatus,
          msg: (boolStatus) ? 'Is an array!' : 'Must be an array!'
        }
        break;
        /** array empty ? */      
      case 'emptyArray':
        boolStatus = (val.length > 0);
        return {
          status: boolStatus,
          msg: (boolStatus) ? 'Contains items!' : 'Is empty!'
        }                
        break;
        /** String? */      
      case 'typeString':
        boolStatus = (typeof val === 'string');
        return {
          status: boolStatus,
          msg: (boolStatus) ? 'Is a string!' : 'Must be a string!'
        }           
        break;
        /** String? */      
      case 'emptyString':
        boolStatus = (val.length > 0);
        return {
          status: boolStatus,
          msg: (boolStatus) ? 'Contains charakters!' : 'Is empty!'
        } 
        break;      
        /** Integer? */
      case 'typeInt':
        boolStatus = (Number.isInteger(val));
        return {
          status: boolStatus,
          msg: (boolStatus) ? 'Is an integer!' : 'Must be an integer!'
        }               
        break;
    } 
    
}
  
}

/****
 * Classes
 ****/
  class Data{
    
    /** Method */
    createList(arr,str){
       /**
        * Check parameters
        *** 
        * arrCheck contains all checks and their details
        * - Which parameter and what should be checked?    
        */   
         let arrCheck = [
           {
             typeArray: parameter.check(arr,'typeArray'),
             emptyArray: parameter.check(arr,'emptyArray'),
           },
           {
             typeString: parameter.check(str,'typeString')
           }     
         ]

      /** 
       * Get the final result for the parameter check. true if there were errors (one status value is false)
       */   
        let objCheckResult = parameter.status(arrCheck);

      /** 
       * Paramter error(s). return stop also the code here.
       */
        if(objCheckResult === true){
         console.log('Es gab Fehler bei den Parametern!', arrCheck);
         return {
           status: false,
           response: arrCheck
         }
        }

      /** 
       * Paramter(s) are fine. Execute the method script and return status and response.
       */    
        let arrLi = arr.map(item => `<li>${item}</li>`);
        return {
          status: true,
          response: arrLi
        }
    }
  }

/****
 * Script
 ****/

  /** Array */
  const arrMovies = [
    'Batman Begins',
    'Prometheus',
    'I Am Legend'
  ];
  
  /** Objekt der Klasse Data erzeugen */
  const movies = new Data();
  
  /** Methode ausführen und Parameter übergeben, die geprüft werden */
  // const objCheckedResult = movies.createList(arrMovies,3);       // status: false
  // const objCheckedResult = movies.createList(2,2);               // status: false
  const objCheckedResult = movies.createList(arrMovies,'Movies');   // status: true

  /** Log the result object of checked parameters */
  console.log('result: ', objCheckedResult);



              
            
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