Comma for each digit
When using JavaScript, there are situations where you need to insert a comma in a number.
There is a function to use in such cases.
toLocaleString
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toLocaleString()
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Automatically inserts a comma based on the client browser.
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toLocaleString(locale)
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If you enter a locale value, it inserts a comma or special character according to the language of that country.
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toLocaleString(locale, options)
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options can set the units of the returned value, etc. - Options address Please refer to here.
Example
const number = 123456789; // number
const res01 = number.toLocaleString(); // string
// res01 : 123,456,789
const res02 = number.toLocaleString('ko-KR');
// res02 : 123,456,789
const res03 = number.toLocaleString('ko-KR', {style: 'percent'}); // res03 : 12,345,678,900%Conclusion
You can use it very simply without implementing the function yourself.