Counting elements of an array using a recursive function in JS?

The recursive function calls itself with some base condition. Let’s say the following is our array with marks −

var listOfMarks=[56,78,90,94,91,82,77];

Following is the code to get the count of array elements −

Example

function countNumberOfElementsUsingRecursive(listOfMarks) {
   if (listOfMarks.length == 0) {
      return 0;
   }
   return 1 +
   countNumberOfElementsUsingRecursive(listOfMarks.slice(1));
}
var listOfMarks=[56,78,90,94,91,82,77];
console.log("The array=");
console.log(listOfMarks);
var numberOfElements=countNumberOfElementsUsingRecursive(listOfMarks);
console.log("The Number of elements = "+numberOfElements);

To run the above program, you need to use the following command −

node fileName.js.

Here, my file name is demo110.js.

Output

This will produce the following output −

PS C:\Users\Amit\JavaScript-code> node demo110.js
The array=[
   56, 78, 90, 94,
   91, 82, 77
]
The Number of elements = 7