Obtaining an array from a split string with negative values may be achieved by following these steps

Question

Obtaining an array from a split string with negative values may be achieved by following these steps

I'm struggling to find the right approach here.

Can someone help me convert the number -800 into [-8, 0, 0]?

To start, I turned the number into a string and used the map function to create an array:

const number = -800;
const numberString = number.toString();
const arrayString = numberString.split('').map((x) => +x);

console.log(arrayString)

The current result is [ NaN, 8, 0, 0 ]

How can I change the NaN and first index of 8 to make it -8, while keeping the other indexes unchanged? This way, it will be [-8, 0, 0]

Any assistance would be greatly appreciated!

Thank you.

javascript arrays arraylist negative-number columnsorting

Answer 1

Answer №1

Consider using numberString.match(/-?\d/g) in place of split

let num = -900;
let stringNum = num.toString();
let newArr = stringNum.match(/-?\d/g).map(y => +y);

console.log(newArr)

Answer 2

Consider using numberString.match(/-?\d/g) in place of split

let num = -900;
let stringNum = num.toString();
let newArr = stringNum.match(/-?\d/g).map(y => +y);

console.log(newArr)

Answer 3

Answer №2

To tackle this challenge, one approach is to perform the operation on the absolute value of the number and within the map function, verify if the original number was negative (specifically for the first index).

const number = -800;
const numberString = Math.abs(number).toString();
const arrayString = numberString.split``.map((x, i) => i == 0 && number < 0 ? -x : +x);

console.log(arrayString)

Answer 4

To tackle this challenge, one approach is to perform the operation on the absolute value of the number and within the map function, verify if the original number was negative (specifically for the first index).

const number = -800;
const numberString = Math.abs(number).toString();
const arrayString = numberString.split``.map((x, i) => i == 0 && number < 0 ? -x : +x);

console.log(arrayString)

Answer 5

Answer №3

If you're unsure about regular expressions (Regex), you can utilize the Array.from method to convert a string into an array of numbers. Then, manipulate the first number based on the original number's sign.

console.log(convertNumberToArray(800));
console.log(convertNumberToArray(-800));

function convertNumberToArray(number){
  var result = Array.from(Math.abs(number).toString(), Number);
  result[0] *= number <= 0 ? -1 : 1;
  return result;
}

Answer 6

If you're unsure about regular expressions (Regex), you can utilize the Array.from method to convert a string into an array of numbers. Then, manipulate the first number based on the original number's sign.

console.log(convertNumberToArray(800));
console.log(convertNumberToArray(-800));

function convertNumberToArray(number){
  var result = Array.from(Math.abs(number).toString(), Number);
  result[0] *= number <= 0 ? -1 : 1;
  return result;
}

Answer 7

Answer №4

Implement a solution using the String#match method along with regular expressions to match an optional hyphen followed by the digit.

var num = -800;
var numStr = num.toString().match(/-?\d/g);
var numInt = [];

for (var j = 0; j < numStr.length; j++) {
    numInt.push(parseInt(numStr[j]));
}
console.log(numInt);

Answer 8

Implement a solution using the String#match method along with regular expressions to match an optional hyphen followed by the digit.

var num = -800;
var numStr = num.toString().match(/-?\d/g);
var numInt = [];

for (var j = 0; j < numStr.length; j++) {
    numInt.push(parseInt(numStr[j]));
}
console.log(numInt);

Obtaining an array from a split string with negative values may be achieved by following these steps

Answer №1

Answer №2

Answer №3

Answer №4

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