round a number to the nearest tenth in javascript

To round a number to the nearest tenth in JavaScript, you can use the Math.round() function and multiply the number by 10 and then divide it by 10.

index.tsx
let num = 14.1234;
let roundedNum = Math.round(num * 10) / 10;
console.log(roundedNum); // Output: 14.1
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In the code above, we first define a variable num and assign it the value of 14.1234. We then round the number to the nearest tenth by multiplying it by 10 and then dividing it by 10 using the Math.round() function. The result is stored in the roundedNum variable, which will be equal to 14.1.

You can also use the toFixed() method to round the number and format it to a specified number of decimal places. In this case, we would set the decimal places to 1.

index.tsx
let num = 14.1234;
let roundedNum = num.toFixed(1);
console.log(roundedNum); // Output: 14.1
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The toFixed() method returns a string, so it's important to convert it back to a number using the parseFloat() function if you need to perform further math operations on it.