In JavaScript, Number is a data type used to represent numeric value. It can be used to store integers, floating-point numbers, and other numeric values.
Here is the syntax for creating a Number in JavaScript:
let num = 42; // an integer value
let num2 = 3.14; // a floating-point valueJavaScript provides various methods and properties to work with numbers, such as:-
| Method/Property | Description |
|---|---|
Number.parseInt() | Parses a string and returns an integer. |
Number.parseFloat() | Parses a string and returns a floating-point number. |
Number.MAX_VALUE | Returns the largest possible number in JavaScript. |
Number.MIN_VALUE | Returns the smallest possible number in JavaScript. |
Number.NaN | Represents a value that is “Not-a-Number“. |
Number.isNaN() | Returns true if the value passed as an argument is NaN, and false otherwise. |
Number.isFinite() | Returns true if the value passed as an argument is a finite number, and false otherwise. |
JavaScript Number Example
Simple example code.
<!DOCTYPE html>
<html>
<body>
<script>
// Storing integer values
let age = 27;
let quantity = 3;
// Storing floating-point values
let price = 4.99;
let temperature = -10.5;
// Using some methods and properties
console.log(Number.parseInt("10"));
console.log(Number.parseFloat("3.14"));
console.log(Number.MAX_VALUE);
console.log(Number.MIN_VALUE);
console.log(Number.NaN);
console.log(Number.isNaN(5));
console.log(Number.isFinite(1/0));
</script>
</body>
</html>Output:
JavaScript Number() Function
In JavaScript, the Number() function is used to convert a value to a Number data type. It can be called with or without the new keyword. If called without the new keyword, it returns a primitive number value. If called with the new keyword, it returns a Number object.
let num1 = Number("42");
let num2 = Number("3.14");
let num3 = Number("Hello");
let numObj = new Number("42")
console.log(typeof num1); // Output: "number"
console.log(typeof numObj); // Output: "object"
console.log(num3); // Output: NaN
Do comment if you have any doubts or suggestions on this JS number topic.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version