@js-draw/math
Version:
A math library for js-draw.
27 lines (26 loc) • 788 B
JavaScript
import { numberRegex } from './constants.mjs';
/**
* Returns the length of `numberAsString` after a decimal point.
*
* For example,
* ```ts
* getLenAfterDecimal('1.001') // -> 3
* ```
*/
export const getLenAfterDecimal = (numberAsString) => {
const numberMatch = numberRegex.exec(numberAsString);
if (!numberMatch) {
// If not a match, either the number is exponential notation (or is something
// like NaN or Infinity)
if (numberAsString.search(/[eE]/) !== -1 || /^[a-zA-Z]+$/.exec(numberAsString)) {
return -1;
// Or it has no decimal point
}
else {
return 0;
}
}
const afterDecimalLen = numberMatch[3].length;
return afterDecimalLen;
};
export default getLenAfterDecimal;