Problem with formating decimal places in Javascript

Question

I have a problem with decimal places. My code gives me the result 123 123 12, while I need to display the result in the form 12 312 312.

Can anyone help setting this formatting?

Code here:

        var fcqInteger = parseInt(fcq.replace(/\s/g, ''));
        valPrice = parseFloat(valPrice.replace(',', '.'));
        var marketCap = (fcqInteger * valPrice)+'';
        // result
        var marketCapParts = marketCap.match(/[\s\S]{1,3}/g) || []; 
        marketCap = marketCapParts.join(' ');

Thanks for help.

A constant value that doesn't change. This is not an important variable. The most important is the variable is marketCap. — Damian Sonek
– Damian Sonek, Commented Jan 17, 2020 at 10:27
Another variable that gets the value from outside. It is formatted because it must format the result. — Damian Sonek
– Damian Sonek, Commented Jan 17, 2020 at 10:31

Nina Scholz · Accepted Answer · 2020-01-17 10:47:28Z

4

You could replace with space by looking to the end of the string for groupd of three.

var data = '12312312'

console.log(data.replace(/.{1,3}(?=(...)+$)/g, '$& '));  // replace
console.log(data.match(/.{1,3}(?=(...)*$)/g).join(' ')); // match/join

edited Jan 17, 2020 at 10:47

answered Jan 17, 2020 at 10:28

Nina Scholz

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5 Comments

Damian Sonek Over a year ago

It works, buy your code shortens my 8 character number to 5, so from 123 123 12 it gets 12 312. How to set this format for 8 characters?

Nina Scholz Over a year ago

this approach adds only spaces, but not shorten the string. please add some strings for testing to the question along with the wanted result.

Damian Sonek Over a year ago

116-117 (Market Cap) codepen.io/damiansonek/pen/oNgPKKM

Nina Scholz Over a year ago

i am using replace, your code has match and works different. by matching, the last portion goes. by using match, you need another quantifier for having an empty part, like /.{1,3}(?=(...)*$)/g

Damian Sonek Over a year ago

You helped me a lot. Thank you very much. Replacing +$ to *$ solved the problem.

arizafar · Accepted Answer · 2020-01-17 15:41:02Z

1

You can use Number.toLocaleString and then replace the , with spaces.

let num = '123 123 12';
let out = Number(num.replace(/\s/g, '')).toLocaleString('us-US', {maximumFractionDigits: 5}).replace(/,/g, ' ');
console.log(out)

edited Jan 17, 2020 at 15:41

answered Jan 17, 2020 at 10:32

arizafar

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3 Comments

Nico Over a year ago

i guess you should specify locale string to toLocaleString, the above code, for instance, is not working for me.

Nico Over a year ago

To use the browser's default locale, omit this argument, so in my case ("it-IT") the separator is . not , var formatted = (fcqInteger * valPrice).toLocaleString('us-US').replace(/\./g," ")

arizafar Over a year ago

@Nico added the locale thanks for pointing out, also updated to handle decimal.

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