Putting spaces between numbers in javascript

Question

12051852 data like this is coming. I want to change it to 12.051.852. The number may be lower or higher. For example, I want to make the number 88312 88.312. How can I do Javasciprte? Thank you from now.

Answer 1

var a = 531123121

var myStr = a.toString().split("")
var myIndex = 0;
for(let i in a.toString().split("")){
 var revIndex = a.toString().length - (parseInt(i)+1);
 if((myIndex)==2 && revIndex!=0 && revIndex!=a.toString().length-1){
   myStr.splice(revIndex,0,".")
   myIndex = 0
 }else myIndex+=1
}

console.log(myStr.join(""))

Answer 2

You can do this very simply using the Intl API, and formatting the number to Spanish (es-ES).

Note: the language has come a long way since 2010 which is where of most of those answers in the duplicate come from.

const number = 12051852;
const number2 = 88312;
const number3 = 9;
const number4 = 12345678910;

const out = Intl.NumberFormat('es-ES').format(number);
const out2 = Intl.NumberFormat('es-ES').format(number2);
const out3 = Intl.NumberFormat('es-ES').format(number3);
const out4 = Intl.NumberFormat('es-ES').format(number4);

console.log(out);
console.log(out2);
console.log(out3);
console.log(out4);

Answer 3

You can use a regular expression to group your numbers.

const rx = /(\d+?)(?=(\d{3})+(?!\d)|$)/g

const data = [
  '12345678',
  '12345',
  'not_valid',
  '1',
  '12',
  '123',
  '1234',
  '12345',
  '123456',
  '1234567891234567891234567891234567',
  '12345678912345678912345678912345678',
  '123456789123456789123456789123456789',
]

function parse(value) {
  const m = value.match(rx)
  let parsed
  if (m) { 
    parsed = m.join('.')
  }
  return parsed
}

data.forEach(it => {
  console.log(it, parse(it))
})