significantDigits

Count the number of significant digits in a number.

function significantDigits(x)
// x: a number

const xnumber = require('extra-number');


xnumber.significantDigits(0.0034);
// → 2

xnumber.significantDigits(120.5e50);
// → 4

xnumber.significantDigits(120.5e-50);
// → 4

References

• Significant figures: Wikipedia
• What is the fastest way to count the number of significant digits of a number?