Introduction
In this lab, we will explore how to round numbers to a given precision using JavaScript. We will learn how to use the Math.round() method and template literals to round a number to a specified number of digits or to an integer value. This knowledge will be useful in situations where we need to display numbers in a more readable format, such as dealing with currency or measurements.
This is a Guided Lab, which provides step-by-step instructions to help you learn and practice. Follow the instructions carefully to complete each step and gain hands-on experience. Historical data shows that this is a beginner level lab with a 97% completion rate. It has received a 96% positive review rate from learners.
Here's how to round a number to a given precision in JavaScript:
const round = (n, decimals = 0) =>
Number(`${Math.round(`${n}e${decimals}`)}e-${decimals}`);
- Use
Math.round()and template literals to round the number to the specified number of digits. - If you want to round to an integer, omit the second argument,
decimals. - To start practicing coding, open the Terminal/SSH and type
node. - For example,
round(1.005, 2)will return1.01.
Summary
Congratulations! You have completed the Round Number to Given Precision lab. You can practice more labs in LabEx to improve your skills.