JavaScript is one of the most popular programming languages that are used to develop interactive and dynamic websites. It offers a lot of builtin functions and methods that make it easier to perform various tasks efficiently, one of which is the toFixed() method.
The toFixed() method is a builtin function of JavaScript that returns a string value representing a number in fixedpoint notation. It formats a number with a specific number of digits to the right of the decimal point, and rounds the original number off if necessary.
Syntax
The syntax for the toFixed() method is as follows:
number.toFixed(digits)
Here, "digits" is an optional parameter that specifies the number of digits to appear to the right of the decimal point. If the value of digits is less than 0 or greater than 20, a RangeError exception is thrown.
Examples
Letâ€™s look at some examples to better understand how to use the toFixed() method.
Example 1:
var num1 = 1200;
document.write(num1.toFixed(2)); //Outputs 1200.00
In the above example, toFixed() method is used to display the number 1200 with two decimal places.
Example 2:
var num2 = 1200.5;
document.write(num2.toFixed(0)); //Outputs 1201
In this example, the toFixed() method is used to round off the number 1200.5 and display it as 1201.
Example 3:
var num3 = 1234.56789;
document.write(num3.toFixed(3)); //Outputs 1234.568
Here, toFixed() method is used to round off the number to three decimal places.
In this way, the toFixed() method can be used to format numbers with a specific number of decimal places according to your application requirements.
Conclusion
In conclusion, the toFixed() method is a useful builtin function of JavaScript that allows you to format numbers in fixedpoint notation with a specific number of decimal places. By using this method, you can easily format your numbers without sacrificing accuracy. We hope this article has helped you understand how the toFixed() method works and how to use it with code examples.
The toFixed() method in JavaScript is very useful when you need to format numbers with a specific number of decimal places. This method is commonly used when dealing with monetary values or other data where precision is essential, and the number of decimal places needs to get controlled.
Apart from its syntax, which contains only one parameter that indicates the number of decimal places that are required, there are some other things to keep in mind while working with the toFixed() method in JavaScript.
One of the critical considerations is that toFixed() always returns the result in the form of a string. So, it is not suitable for mathematical calculations. Before performing any arithmetic operations, you should always extract the number from the string by parsing it as a float.
Another thing to keep in mind when working with toFixed() is that it can cause rounding errors. The method rounds the number up or down to meet the specified decimal place, which can lead to unexpected results in some situations. To ensure greater accuracy, it is best to use other methods like Math.round() or Math.floor() when dealing with decimal numbers.
Besides, the toFixed() method can be combined with other JavaScript functions, including event handlers, conditional statements, and loops. By using toFixed() with these functions, you can control the display of numbers in your applications dynamically.
Here's an example illustrating the combination of toFixed() method with ifelse statement and event handling:
Calculate Total Price
Enter the price:
In this example, the user enters a price which is then used to calculate the total price including tax. If the entered value is not a number, the program displays an error message. In case it is a number, the toFixed() method formats the total price up to two decimal places. The result is displayed dynamically on the webpage using the innerHTML property.
In conclusion, the toFixed() method is a powerful builtin function of JavaScript that is used to format numbers with a specified number of decimal places. By using toFixed() method, you can display numbers on your webpage or application with greater precision and accuracy.
Popular questions

What does the toFixed() method do in JavaScript?
Answer: The toFixed() method in JavaScript is used to format a number with a specific number of digits to the right of the decimal point and round the original number off if necessary. 
How many parameters does the toFixed() method take?
Answer: The toFixed() method takes one optional parameter that specifies the number of digits to appear to the right of the decimal point. 
What is the output of 1234.56789.toFixed(3)?
Answer: The output of 1234.56789.toFixed(3) is 1234.568. 
Can the toFixed() method cause rounding errors?
Answer: Yes, the toFixed() method can cause rounding errors since it rounds off the number up or down to meet the specified decimal places. 
How is the toFixed() method combined with other JavaScript functions?
Answer: The toFixed() method can be combined with other JavaScript functions, including event handlers, conditional statements, and loops, to control the display of numbers in your applications dynamically.
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