15 lines
640 B
Markdown
15 lines
640 B
Markdown
### toDecimalMark
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Convert a float-point arithmetic to the [Decimal mark](https://en.wikipedia.org/wiki/Decimal_mark) form.
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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.
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Use [Ttemplate Literals](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals) to return joined parts.
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```js
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const toDecimalMark = (num) => {
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let numberParts = num.toString().split('.')
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return `${numberParts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ',')}.${numberParts[1]}`
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}
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// toDecimalMark(12305030388.9087) //-> '12,305,030,388.9087'
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```
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