Converting Phone String to Integer In Javascript

I am attempting to convert a phone number string into an integer by using parseInt but only receiving the first 3 digits in return and then I would like to add all of the integers of each phone number. Here is my code:

var largest_phone_number = [];
largest_phone_number.push("415-215-2561", "312-367-6721", "345-876-5467");


for(var i=0; i<largest_phone_number.length; i++) {
var number = parseInt(largest_phone_number[i]);
  console.log(number);
}

Solution

That's because parseInt will convert up to the first character that's not convertible, hence 3 digits. You could start by stripping out non-numbers with regex first, then do a parseInt. Don't forget the radix for parseInt. You wouldn't want to end up with an octal.

var phoneNumbers = largest_phone_number.map(function(number){
  return parseInt(number.replace(/[^0-9]/g, ''), 10);
});
// [4152152561, 3123676721, 3458765467]

Some tips for phone numbers:

There are phone numbers whose area code starts with 0. parseInt will disregard leading zeroes. Essentially, you just lost information.
There are phone numbers that have these symbols +()- as well as spaces. They will differ in different parts of the world.
It's best to keep phone numbers as strings. Why? Refer to bullets 1 and 2.