How to create pattern for numbers

Question

there. I have a number 20220112 which i need to convert this number to string which will look like this 2022-01-12 Maybe anone knows is there are some patterns in JS which i could use for easy convertation?
Something like const date = patetn(****-**-**) ?

you could have a look [here](https://stackoverflow.com/questions/45031441/masking-a-string/45031815#45031815). — Nina Scholz, Apr 04 '22 at 13:51
Is that really a number? Or rather a string that contains only digits? — Bergi, Apr 04 '22 at 13:58
Then start with `.toString(10)`, check that it's really an 8-digit number, and do ordinary string operations on that. There's no builtin `pattern` function or something that would do this for you. — Bergi, Apr 04 '22 at 14:02

score 2 · Accepted Answer · answered Apr 04 '22 at 14:12

Write a function where you first cast the passed value to a string. then you can format the string to your pattern.

function formatNumber(num) {  
    return String(num).replace(/(\d{4})(\d{2})(\d{2})/, '$1-$2-$3');
}

console.log('formatted: ', formatNumber("20220401") )

How to create pattern for numbers

1 Answers1