Challenge_5.md

Challenge 5: Normalize Phone Number (OPTIONAL)

Objective

Create the normalizePhoneNumber function that takes a string representing a ten-digit number and returns it formatted in a specific phone number format.

Function

function normalizePhoneNumber(num)

Parameters

• num: A string representing a ten-digit phone number.

Requirements

1. Format the input string num into the phone number format: "(XXX) XXX-XXXX".
2. You can assume that all entries will be exactly 10 digits long.

Examples

Example 1

let result = normalizePhoneNumber("9876543210");
console.log(result);

Expected Output:

"(987) 654-3210"

Example 2

let result = normalizePhoneNumber("1111111111");
console.log(result);

Expected Output:

"(111) 111-1111"

Edge Cases

• Ensure that the function accurately checks for the length of the input string and validates each character.

Hints

• Consider using a template "(XXX) XXX-XXXX" and loop backwards, replacing 'X' with digits from the input number.

Canvas References

• Arrays
• Basic Array Methods