How to Round a Number to Decimal Points in Node.js
How do you round a number to a specific decimal point using Node.js?
Node.js has a built-in method called toFixed() that formats a number using fixed-point notation. The
toFixed() method takes one number parameter that tells it how many digits to appear after the decimal point. This number can be a value between
And the method will return a
string value representing the new number generated using fixed-point notation.
Here's an example:
const number = 42.235888 const newNumber = number.toFixed(2) // newNumber = 42.24
Notice that the
.toFixed(2) method transforms the
42.235888 number to a new version with only
2 decimal points.
What happens if you applied the decimal point to a whole number?
Here's a code example for that:
const number = 42 const newNumber = number.toFixed(3) // newNumber = 42.000
Notice how the new number created by the
.toFixed(3) method has
3 digits behind the decimal point even though they're zero.
Pretty cool, right?
Let's go over one more example where we want to transform a number with decimal points to a rounded whole number.
Here's the code:
const number = 42.68231 const newNumber = number.toFixed(0) // newNumber = 43
If you give a value of
0 to the
.toFixed() method, it will round the new number to a whole number.