Converting an array of numbers into a single string

Question

Converting an array of numbers into a single string

I want to transform [1, 2, 3] into ['123']. I need to convert [1, 2, 3] to ['123'] using an arrow function only (no regex):

Required steps:

const functionOne = (arrayOne) => {

};

console.log(functionOne([1, 2, 3]));

This is my attempt:

Firstly, I converted the array to a string which resulted in 1,2,3

Next, I removed the commas in order to combine the numbers. This yielded 123.

Finally, I tried to place the number as a string back into the array but this did not work as expected. It gave me ['1', '2', '3'] instead of ['123']. I believe the issue lies with the .split method in my code and I am currently exploring other options as I learn JavaScript.

const functionOne = (arrayOne) => {

  let stepOne = arrayOne.toString(arrayOne => arrayOne.toString());

  console.log(stepOne);

  stepOne = stepOne.split(',').join('');

  console.log(stepOne);

  return stepOne.split('');

};

console.log(functionOne([1, 2, 3]));

javascript arrays string function numbers

Answer 1

Answer №1

If you want to concatenate all the elements of an array into a single string, you can use the join method with an empty string as the delimiter. Then, to store this result in an array as its only element, you can wrap it with square brackets like this: [____]:

const combineArrayElements = (array) => [array.join("")];
console.log(combineArrayElements([1, 2, 3]));

The issue with your original approach are as follows:

The toString method of arrays ignores any arguments and defaults to using join(",").
Splitting the array on , returns another array containing strings.
Rejoining these strings with join('') will give you "123", but it won't be placed inside an array.

Answer 2

If you want to concatenate all the elements of an array into a single string, you can use the join method with an empty string as the delimiter. Then, to store this result in an array as its only element, you can wrap it with square brackets like this: [____]:

const combineArrayElements = (array) => [array.join("")];
console.log(combineArrayElements([1, 2, 3]));

The issue with your original approach are as follows:

The toString method of arrays ignores any arguments and defaults to using join(",").
Splitting the array on , returns another array containing strings.
Rejoining these strings with join('') will give you "123", but it won't be placed inside an array.

Answer 3

Answer №2

If you're looking for a solution, consider using a recursive function.

function sum(arr) {
    if (arr.length === 0) {
        return 0;
    }
    
    const [first, ...rest] = arr;
    return first + sum(rest);
}

console.log(sum([1, 2, 3]));

Answer 4

If you're looking for a solution, consider using a recursive function.

function sum(arr) {
    if (arr.length === 0) {
        return 0;
    }
    
    const [first, ...rest] = arr;
    return first + sum(rest);
}

console.log(sum([1, 2, 3]));

Answer 5

Answer №3

function transformArray(arr) {
  let str = arr.toString();
  str = str.split(',').join('');
   return [str];
};

console.log(transformArray([4, 7, 9]));

By using the .toString() method on the array [4, 7, 9], it will be converted to the string "4,7,9". Next, the .split(',').join('') removes the commas and combines the numbers into a single string "479". Finally, we return this result as an array ['479'].

Answer 6

function transformArray(arr) {
  let str = arr.toString();
  str = str.split(',').join('');
   return [str];
};

console.log(transformArray([4, 7, 9]));

By using the .toString() method on the array [4, 7, 9], it will be converted to the string "4,7,9". Next, the .split(',').join('') removes the commas and combines the numbers into a single string "479". Finally, we return this result as an array ['479'].

Converting an array of numbers into a single string

Answer №1

Answer №2

Answer №3

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