round a number to the nearest ten thousandth in typescript

To round a number to the nearest ten thousandth in TypeScript, you can use the toFixed() method. Here's an example:

index.ts
let num = 1234.56789;
let roundedNum = +num.toFixed(4); // 1234.5679
69 chars
3 lines

The toFixed(4) method rounds the number to 4 decimal places and returns it as a string. The + sign before the method call coverts the string back to a number.

If you want to round the number to the nearest ten thousandth, you can multiply it by 10000, round it to the nearest integer, and then divide it by 10000 again. Here's an example:

index.ts
let num = 1234.56789;
let roundedNum = Math.round(num * 10000) / 10000; // 1234.5679
85 chars
3 lines

The Math.round() method rounds the number to the nearest integer, and dividing it by 10000 gives you the rounded number to the nearest ten thousandth.