split a string with 2 decimals after dot

Question

I have the following string.

var string = '14,12.1545';

In the above variable I need to take two decimals after dot. How to split the variable with dot.

the expected output is 14,12.15

it looks a bit similar to this question: https://stackoverflow.com/questions/50074298/parseint-fixing-the-value — Nina Scholz, Apr 28 '18 at 09:37
@NinaScholz Finally I want to take only two decimals after dot. that's why I thought split — user9130953, Apr 28 '18 at 09:38

score 3 · Accepted Answer · answered Apr 28 '18 at 09:39

From a pure string manipulation point of view: separate the string into two parts, one before the dot and one after. Use slice to select only the first two characters of the after-string, and then put them back together.

function translateString(input) {
  const [beforeDot, afterDot] = input.split('.');
  const afterDotTrimmed = afterDot.slice(0, 2);
  return beforeDot + '.' + afterDotTrimmed;
}
console.log(translateString('14,12.1545'));
console.log(translateString('14,12.1'));
console.log(translateString('14,12.154534534534'));

You could also use a regular expression:

function translateString(input) {
  return input.replace(/\.(\d{1,2}).*$/, '.$1');
}
console.log(translateString('14,12.1545'));
console.log(translateString('14,12.1'));
console.log(translateString('14,12.154534534534'));

score 1 · Answer 2 · answered Apr 28 '18 at 09:44

1

Convert it to array and make the changes

let str='14,12.1123,3.1415926554';
let arr=str.split(",");
let n=arr.map(a=>a.indexOf('.') !== -1 ? parseFloat(a).toFixed(2) : parseFloat(a));
console.log(n.join(","));

answered Apr 28 '18 at 09:44

sumit

15,003
12
69
110

score 1 · Answer 3 · answered Apr 28 '18 at 09:56

You can borrow a suitable number formatter from previous answers, like this: How can I format numbers as dollars currency string in JavaScript?

Then you can change your text to a number and format it. I assume that you want round from half up, like this:

// suitable answer from question 149055
Number.prototype.format = function(n, x) {
    var re = '\\d(?=(\\d{' + (x || 3) + '})+' + (n > 0 ? '\\.' : '$') + ')';
    return this.toFixed(Math.max(0, ~~n)).replace(new RegExp(re, 'g'), '$&,');
};

var string = '14,12.1545'
var number = parseFloat(string.replace(/,/g , ""))
console.log(number.format(2, 2)) // -> 14,12.15

string = '99,99.9999'
number = parseFloat(string.replace(/,/g , ""))
console.log(number.format(2, 2)) // -> 1,00,00.00

split a string with 2 decimals after dot

3 Answers3