是否有返回 BigNumber.js 中字符数的 function？

Question

I know about decimalPlaces :

const number = new BigNumber(100.5254);
number.decimalPlaces(); // 4

And precision :

const number = new BigNumber(100.5254);
number.precision(); // 7

But I couldn't find any function that returns only the number of characteristics. That is, in this example, 3 ("1", "0" and "0").

Is there something for this?

Answer 1

It seems there isn't one, as of Nov 2019 at least, but you can subtract the decimal places from the total precision to get the digits before the dot:

const number = new BigNumber(100.5254);
const digitsBeforeDot = number.precision(true) - number.decimalPlaces();
// prints 3

Note that:

If d (the first parameter of the precision function) is true then any trailing zeros of the integer part of a number are counted as significant digits, otherwise they are not.

See the docs:

• decimalPlaces()
• precision()