findPalindromeNumbersRange()

Step 1: Understanding the problem

First, we need to understand the problem that we must solve. To find the palindrome numbers in a particular range means we need to identify any number that reads the same forward as it does backward within a certain set of numbers. For example, the number 121 is a palindrome because it remains 121 if we read both from the left and from the right.

   function findPalindromeNumbersRange(start, end) {
      // our code will go here
   }

Step 2: Setup the loop

We will start by setting up a for loop that will iterate through the specific range of numbers provided as arguments to our function. This loop will start at the start number and end at the end number.

   function findPalindromeNumbersRange(start, end) {
      for (let i = start; i <= end; i++) {
         // Our checking process will go here
      }
   }

Step 3: Check if a number is a palindrome

For now, we understand that palindrome number is the number which remains the same even if its digits are reversed. So, we convert the number into a string and reverse it. Then, we check if reversed number as string is the same as original number as string, if they are the same that means the number is palindrome.

  function findPalindromeNumbersRange(start, end) {
      for (let i = start; i <= end; i++) {
         let reversedNumber = i.toString().split("").reverse().join("");
         if (i.toString() === reversedNumber) {
           // It's a palindrome!
         }
      }
   }

Step 4: Collecting palindrome numbers

Next, we want to store all palindrome numbers that we find within the range. So, let's create an empty array palindromes at the top of our function. Whenever we find a palindrome, we will add it to this array.

  function findPalindromeNumbersRange(start, end) {
      let palindromes = [];
      
      for (let i = start; i <= end; i++) {
        let reversedNumber = i.toString().split("").reverse().join("");
        if (i.toString() === reversedNumber) {
          palindromes.push(i);
        }
      }
  }

Step 5: Return the result

Now that we have collected all of the palindromes, the only thing left to do is to actually return them from our function. We will add a return statement to do that, and with that, our function is complete.

Here is the final implementation of our palindrome finder function:

  function findPalindromeNumbersRange(start, end) {
      let palindromes = [];
      
      for (let i = start; i <= end; i++) {
        let reversedNumber = i.toString().split("").reverse().join("");
        if (i.toString() === reversedNumber) {
          palindromes.push(i);
        }
      }
      
      return palindromes;
  }

Conclusion

Our function findPalindromeNumbersRange takes in a start and end number, and it returns an array of all palindrome numbers within that range. This function demonstrates some key JavaScript concepts, such as loops, conditionals, and array manipulation. We also used the methods toString, split, reverse and join to reverse our number for palindrome checking. Our function is concise, efficient, and gets the job done in just a few lines of code.