Manipulating Javascript Array with for-of

1. Filtering an array with for-of

function filterArray( arrayList, callBackFunc){
  const output = [];
  
   for(const val of arrayList){
    if(callBackFunc(val)){ 
      output.push(val)     
     }
   }
   return output
}

filterArray(['','Mango','','Apple',''], str => str.length > 0)

2. Mapping an array with for-of

function mapArray(arrayList, callBackFunc){
   const output = [];
   
    for(const val of arrayList){
     output.push(callBackFunc(val));
   }
   
    return output
}
mapArray([1,2,3], num => num + num);

3. Filtering and Mapping an array with for-of

function getSeriesTitles(cwSeries, minRating){
   const output= [];
   for(const series of cwSeries){
      if(series.rating >= minRating) result.push(series.title)
     }
    return output
}
const cwSeries= [
     { title: 'Arrow', rating: 8.8 },
     { title: 'Flash', rating: 7.9 },
     { title: 'Lucifer', rating: 8.1 },
     { title: 'Legends of Tomorrow', rating: 8.5 },
    { title: 'Super Girl', rating: 7.8 },
];

getSeriesTitles(cwSeries, 8);

4. Finding an item in an Array with for-of

function findInArray(arrayList,callBackFunc){
   for(const[index,value] of arrayList.entries()){
     if(callBackFunc(value)) return{index,value}
     }
    return undefined
}
findInArray(['','a','','bimbo','c','tao'],str=> str.length > 1);

5. Finding the average of the values in an array of objects with for-of

function averageStudentGrade(students){
     let sumOfGrades = 0;
     for(const student of students){
        sumOfGrades += student.grade;
        }
       return sumOfGrades / students.length;
    }
const STUDENTS = [
    {
      id: 'qk4k4yif4a',
      grade: 4.0,
    },
    {
      id: 'r6vczv0ds3',
      grade: 0.25,
     },
     {
      id: '9s53dn6pbk',
      grade: 1,
     }
];
averageStudentGrade(STUDENTS);

6. Checking a condition with for-of

function everyArrayElement(arrayList,condtion){
     for(const elem of arrayList){
        if(!condtion(elem)){
           return false
          }
       }
         return true;
}
everyArrayElement(['a','','b'], str =>str.length > 1);

Thank you….