JS toFixed - Javascript

When working with financial or mathematical calculations in JavaScript, precision is important. The toFixed() method in JavaScript is a handy function that allows you to format a number with a specified number of digits after the decimal point.

Syntax

number.toFixed(digits)

• number: This is the number you want to format.
• digits: This is the number of digits you want after the decimal point.

Examples

let num = 123.456789;
let formattedNum = num.toFixed(2);
console.log(formattedNum); // Output: "123.46"

In the example above, we have a number 123.456789. We use the toFixed() method to format the number to two decimal places, which results in 123.46.

let num = 0.1 + 0.2;
let formattedNum = num.toFixed(2);
console.log(formattedNum); // Output: "0.30"

In the example above, we are adding 0.1 and 0.2 in JavaScript. However, due to floating-point precision issues, the result is not exactly 0.3. We use the toFixed() method to format the number to two decimal places, which results in 0.30.

Caveats

• The toFixed() method returns a string, not a number.
• If the number being formatted has fewer digits after the decimal point than the specified number of digits, the method will add zeros to the end of the string to match the specified number of digits.

Conclusion

The toFixed() method in JavaScript is a useful tool when working with financial or mathematical calculations that require a certain level of precision. However, it's important to note that it returns a string and may not always produce the expected result due to floating-point precision issues.