Why Is Javascript Recursive Function Returning 'undefined' Even When I Am Returning A Value

I am looking at how to implement binary search in a javascript function and found that when I return the value and save it into a variable then when I console.log this comes as und

Solution 1:

You need some return statements. You could omit the else statements as well, because if returned, it does not execure the else part.

constrecursiveBinarySearch = (numbers, target) => {
  const midpoint = Math.floor(numbers.length / 2);

  if (numbers[midpoint] === target) {
    //it does found the value and returnreturn'FOUND';

  }

  if (numbers[midpoint] < target) {
    returnrecursiveBinarySearch(numbers.slice(midpoint + 1), target);
  }

  returnrecursiveBinarySearch(numbers.slice(midpoint - 1), target);
}
var result = recursiveBinarySearch([1, 2, 3, 4, 6, 8, 100] , 8);
console.log(result); // Here is returning undefined