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Update numberWithCommas.md

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David Wu
2017-12-21 15:29:32 +01:00
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snippets/numberWithCommas.md
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@ -1,19 +1,18 @@
### numberWithCommas
### toDecimalMark
Use commas to separate digits。
Use `toString()` to convert the number `num` to a string, then use `/\B(?=(\d{3})+(?!\d))/g` to separate every three characters with a comma,except word boundary。
```js
const toThousands = (num) => {
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;
}
// toThousands(12305030388.9087) //-> '12,305,030,388.9087'
// toThousands(123.889087e2) //-> '12,388.9087'
// toThousands('12305030388.9087') //-> '12,305,030,388.9087'
// toThousands('12305abc030388.9087') // -> '12,305,030,388.9087'
// toDecimalMark(12305030388.9087) //-> '12,305,030,388.9087'
// toDecimalMark(123.889087e2) //-> '12,388.9087'
// toDecimalMark('12305abc030388.9087') // -> '12,305,030,388.9087'
```