Adding up whole numbers from a string - JavaScript

Question

Adding up whole numbers from a string - JavaScript

JavaScript is still very new to me and I'm facing a challenge:

I have an array containing three phone numbers, and I need to calculate the sum of the digits in each phone number string.
I want to find and return the phone number with the highest sum of digits.

I'm feeling a bit embarrassed because my knowledge of JavaScript is quite limited. However, I am determined to learn more and have plans to enroll in a school program this fall. So far, I've covered functions, for loops, and while loops.

var numbers = ["111-222-3333", "333-444-5555", "959-232-8484"]

I understand that my approach is incorrect, but this is all I know for now. Can someone please guide me on how to solve this?

var total = 0;    

for(var i = 0; i < numbers.length; i++){
   total = total + Number(numbers[i]);
}

alert(total);

javascript arrays function loops parameters

Answer 1

Answer №1

You were making progress. Take the time to review each character in the string.

var highestSum = 0;
var highestNumber;

for (var i=0; i < collection.length; i++) {
   var number = collection[i];
   var total = 0;

   for (var i=0; i < number.length; i++) {
      total += Number(number.charAt(i));
   }

   if (total > highestSum) {
      highestNumber = number;
   }
}

alert(highestNumber);

You can accomplish this by using .charAt(i) to retrieve the character at a specific index, similar to how collection[i] accesses a specific element in the array.

Answer 2

You were making progress. Take the time to review each character in the string.

var highestSum = 0;
var highestNumber;

for (var i=0; i < collection.length; i++) {
   var number = collection[i];
   var total = 0;

   for (var i=0; i < number.length; i++) {
      total += Number(number.charAt(i));
   }

   if (total > highestSum) {
      highestNumber = number;
   }
}

alert(highestNumber);

You can accomplish this by using .charAt(i) to retrieve the character at a specific index, similar to how collection[i] accesses a specific element in the array.

Answer 3

Answer №2

calculateSum computes the total sum of digits in a given phone number, while findMax identifies the phone number with the highest sum.
removeNonDigits( /\D/g, '' ) – eliminates all non-digit symbols from the phone number.
splitDigits( '' ) – breaks down the string of digits into an array.
aggregate(...) – combines the elements of the array. Utilize parseInt to convert each digit to a number.

var calculateSum = function( phoneNumber ) {
    return phoneNumber.replace( /\D/g, '' ).split( '' ).reduce( function( previous, current ) {
        return previous + parseInt( current );
    }, 0 );
};

var findMax = function( phoneNumbers ) {
    var highestSum = 0,
        maxPhoneNumber;

    phoneNumbers.forEach( function( phoneNumber ) {
        var sum = calculateSum( phoneNumber );

        if ( highestSum < sum ) {
           highestSum = sum;
           maxPhoneNumber = phoneNumber;
        }
    } );

    return maxPhoneNumber;
};

findMax( ["111-222-3333", "333-444-5555", "959-232-8484"] );// returns "959-232-8484"

Answer 4

calculateSum computes the total sum of digits in a given phone number, while findMax identifies the phone number with the highest sum.
removeNonDigits( /\D/g, '' ) – eliminates all non-digit symbols from the phone number.
splitDigits( '' ) – breaks down the string of digits into an array.
aggregate(...) – combines the elements of the array. Utilize parseInt to convert each digit to a number.

var calculateSum = function( phoneNumber ) {
    return phoneNumber.replace( /\D/g, '' ).split( '' ).reduce( function( previous, current ) {
        return previous + parseInt( current );
    }, 0 );
};

var findMax = function( phoneNumbers ) {
    var highestSum = 0,
        maxPhoneNumber;

    phoneNumbers.forEach( function( phoneNumber ) {
        var sum = calculateSum( phoneNumber );

        if ( highestSum < sum ) {
           highestSum = sum;
           maxPhoneNumber = phoneNumber;
        }
    } );

    return maxPhoneNumber;
};

findMax( ["111-222-3333", "333-444-5555", "959-232-8484"] );// returns "959-232-8484"

Answer 5

Answer №3

Here is one way to achieve this using a series of function chaining:

const calculateSum = function(input) {
    return String(input)
        .split("")
        .map(s => Number(s))
        .filter(s => !isNaN(s))
        .reduce((a, b) => a + b, 0);
}

Answer 6

Here is one way to achieve this using a series of function chaining:

const calculateSum = function(input) {
    return String(input)
        .split("")
        .map(s => Number(s))
        .filter(s => !isNaN(s))
        .reduce((a, b) => a + b, 0);
}

Adding up whole numbers from a string - JavaScript

Answer №1

Answer №2

Answer №3

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