round a number to the nearest tenth in typescript

To round a number to the nearest tenth in TypeScript, you can use the Math.round() function and some multiplication/division. Here's an example:

index.ts
const num = 13.67;
const roundedNum = Math.round(num * 10) / 10; // multiplies by 10, rounds, then divides by 10
console.log(roundedNum); // output: 13.7
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In this example, we first multiply the original number by 10, which moves the decimal point one place to the right. We then round the resulting number using Math.round(). Finally, we divide the rounded number by 10 to move the decimal point back to its original position and get the final result.

This approach can be generalized to round to any desired number of decimal places by adjusting the multiplication factor used in the Math.round() call. For example, to round to the nearest hundredth, you would multiply by 100 instead of 10.