const strArray = ['JavaScript', 'Python', 'PHP', 'Java', 'C'];
   function mapForEach(arr, fn) { const newArray = [];
     for(let i = 0; i<arr.length; i++) {
       newArray.push(
           fn(arr[i])
       );
    } return newArray;
 }
 const lenArray = mapForEach(strArray, function(item) {
 return item.length;
 });
// prints [ 10, 6, 3, 4, 1 ]
 console.log(lenArray);