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Round Number to Given Precision

Beginner

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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 return 1.01.

Summary

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