30-seconds-of-code/snippets/toDecimalMark.md

toDecimalMark

Convert a float-point arithmetic to the Decimal mark form.

Use toString() to convert the float num to a string, then use regex to separate every three characters of the integer part with a comma.

const toDecimalMark = (num) => {
 let cleanNum = num.toString().split('').filter(n => '0123456789.'.includes(n)).join('') 
 let wholeNum = cleanNum.split('.')[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",")
 let decNum = `.${cleanNum.split('.')[1]}`
 return wholeNum + decNum;
}
// toDecimalMark(12305030388.9087) //-> '12,305,030,388.9087'
// toDecimalMark(123.889087e2) //-> '12,388.9087'
// toDecimalMark('12305abc030388.9087') // -> '12,305,030,388.9087'