How can I increment a numerical string by 1 in JavaScript?
var numberString = "12345612345678901234567890";
I am aiming for the output to be:
"12345612345678901234567891"
I attempted the following:
var numberString = "12345612345678901234567890";
numberString = BigInt(numberString);
var result = numberString + BigInt(1);
However, using BigInt resulted in a value represented in scientific notation such as 1.234567896453e+25.
For adding large numbers, consider using the BigInt library found at BigInteger.js.
var message = "12345612345678901234567890";
var messageAsNumber = bigInt(message);
var messagePlusOne = messageAsNumber.add('1');
console.log(messagePlusOne.toString());<script src="https://peterolson.github.io/BigInteger.js/BigInteger.min.js"></script>Avoiding the use of libraries in 2022, one can simply utilize the BigInt object available in JavaScript here
const text = "12345612345678901234567890";
const bigIntegerText = BigInt(text);
console.log(bigIntegerText + BigInt(1)); // 12345612345678901234567891n
To convert a string into an array, consider taking substrings of length 3 from the end of the string.
There is a specific pattern to determine if adding 1 to an element would result in the sum of that number with its neighboring index equaling 1000. If this condition is met, increment the previous index by 1 and replace the current index with "000".
The provided pattern focuses on adjusting the last two elements of the array; however, it can be expanded to check and modify each index accordingly. This way, any index can be adjusted to "000" while increasing the preceding one by 1.
let message1 = "12345612345678901234567890";
let message2 = "12345612345678901234567999";
let message3 = "12345612345678901234999999";
function addNumberToString(str, numToAdd, digits = []) {
const [N, len, max] = [3, str.length, 1000];
for (let i = -N, l = len; digits.length < len / N; i -= N, l -= N) {
digits.unshift(str.slice(i, l));
}
function add(m) {
if (+digits[digits.length - m] + numToAdd < max) {
let n = +digits[digits.length - m];
digits[digits.length - m] = String(Number(n + numToAdd));
} else {
const M = m + 1;
if (+digits[digits.length - M] + numToAdd < max) {
let n = +digits[digits.length - M];
digits[digits.length - M] = String(Number(n + numToAdd));
digits[digits.length - (M - 1)] = "0".repeat(N);
} else {
if (digits[digits.length - (m + 1)]) {
digits[digits.length - (M - 1)] = "0".repeat(N);
add(m + 1);
}
}
}
return digits.join("")
}
return add(1);
}
console.log(
addNumberToString(message1, 1)
, addNumberToString(message2, 1)
, addNumberToString(message3, 1)
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