JavaScript Number Methods
Overview of JavaScript Number Methods
Welcome to our JavaScript Number Methods tutorial! JavaScript provides a set of built-in methods for working with numbers, allowing you to perform various operations and manipulate numerical data with ease.
In this tutorial, we’ll cover essential JavaScript Number methods, including their syntax and usage. We’ll also provide examples to help you understand how to use these methods effectively in your code. By the end of this tutorial, you’ll have a solid understanding of JavaScript Number methods and how to use them in your projects.
toString()
The toString() method converts a number to a string representation in the specified base.
Example:
const num = 42;
console.log(num.toString()); // Output: "42"
console.log(num.toString(2)); // Output: "101010" (binary representation)
toFixed()
The toFixed() method formats a number with a fixed number of decimal places.
Example:
const num = 3.14159;
console.log(num.toFixed(2)); // Output: "3.14"
toExponential()
The toExponential() method converts a number to exponential notation with a specified number of decimal places.
Example:
const num = 12345.6789;
console.log(num.toExponential(2)); // Output: "1.23e+4"
toPrecision()
The toPrecision() method formats a number to a specified number of significant digits.
Example:
const num = 12345.6789;
console.log(num.toPrecision(4)); // Output: "1235"
parseFloat()
The parseFloat() method parses a string and returns a floating-point number.
Example:
const numString = "42.42";
console.log(parseFloat(numString)); // Output: 42.42
parseInt()
The parseInt() method parses a string and returns an integer of the specified radix.
Example:
const numString = "42";
console.log(parseInt(numString, 10)); // Output: 42
Using Number Methods
Number methods can be helpful in a variety of scenarios when working with JavaScript numbers.
Converting Numbers to Different Bases
The toString() method can be used to convert a number to a different base, such as binary, octal, or hexadecimal.
Example
const num = 255;
console.log(num.toString(2)); // Output: "11111111" (binary)
console.log(num.toString(8)); // Output: "377" (octal)
console.log(num.toString(16)); // Output: "ff" (hexadecimal)
Formatting Numbers for Display
Methods like toFixed(), toExponential(), and toPrecision() can be used to format numbers for display in different ways.
Example:
const num = 12345.6789;
console.log(num.toFixed(2)); // Output: "12345.68"
console.log(num.toExponential(3)); // Output: "1.235e+4"
console.log(num.toPrecision(6)); // Output: "12345.7"
Practice Questions for Number Methods in JS
- What is the purpose of JavaScript Number Methods?
- How can you convert a number to a string representation in a specified base?
- What method can be used to format a number with a fixed number of decimal places?
- How can you parse a string and return a floating-point number or an integer?
- How can you format a number to a specified number of significant digits?
FAQs about Number Methods in JS
Q: What are JavaScript Number Methods?
A: JavaScript Number Methods are functions that perform operations on numbers or convert numbers to different formats. They are part of the Number object in JavaScript.
Q: What is the difference between Number Methods and Number Properties?
A: Number Methods are functions that perform operations on numbers, while Number Properties are constants representing specific numeric values.
Q: Can I create my own Number Methods?
A: Yes, you can create your own functions to perform operations on numbers, but you cannot add them as methods to the built-in Number object.
Q: What are the most commonly used Number Methods?
A: Some commonly used Number Methods include toString(), toFixed(), toExponential(), toPrecision(), parseFloat(), and parseInt().
Q: When should I use Number Methods in my code?
A: Number Methods can be helpful in various scenarios, such as converting numbers to different formats, formatting numbers for display, or parsing strings to return numbers.
