round a number to the nearest hundredth in javascript

To round a number to the nearest hundredth in JavaScript, you can use the built-in Math.round() function and some math magic with powers of 10. Here's an example:

index.tsx
let num = 3.14159265359;
let rounded = Math.round(num * 100) / 100;
console.log(rounded); // output: 3.14
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In this example, we multiply the num value by 100 to shift the decimal point two places to the right. This effectively converts the number to an integer version of itself with two decimal places (e.g. 3.14 * 100 = 314). We then use Math.round() to round that value to the nearest integer, which in this case is 314. Finally, we divide the rounded value by 100 to shift the decimal point back two places to the left (e.g. 314 / 100 = 3.14), giving us the number rounded to the nearest hundredth.