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JavaScript Number Reference - GeeksforGeeks
JavaScript Number Reference
Last Updated : 23 Jul, 2025
JavaScript Numbers are always stored in double-precision 64-bit binary format IEEE 754. The types of number literals You can use decimal, binary, octal, and hexadecimal.
Syntax:
Number(object)
JavaScript
function func() {
// Original string
let a = true;
let value = Number(a);
console.log(value);
}
func();
Output
1
The complete list of JavaScript Numbers is listed below:
JavaScript Number Constructor: In JavaScript, a constructor gets called when an object is created using the new keyword.
Constructor Description Example Number() Returns the number format for any type of javascript variable.
JavaScript Number Properties: A JavaScript property is a member of an object that associates a key with a value. There are two types of Number properties in JavaScript.
- Static Property: A static property is a property that has the same value for the entire class.
Static Properties Description Example EPSILON Shows the difference between 1 and the smallest floating point number which is greater than 1. MAX_SAFE_INTEGER Represents the maximum safe integer. MAX_VALUE Represent maximum numeric values. MIN_SAFE_INTEGER Represents the minimum safe integer. MIN_VALUE Represent minimum numeric values. NaN Represents a value that is not a valid number. NEGATIVE_INFINITY Represents the largest negative value i.e negative infinity. POSITIVE_INFINITY Represents the largest positive value i.e positive infinity.
- Instance Property: An instance property is a property that has a new copy for every new instance of the class.
Instance Properties Description Example constructor Return the number constructor function for the object.
JavaScript Number Methods: JavaScript methods are the actions that can be performed on objects. There are types of Number methods in JavaScript.
- Static Method: If the method is called using the Number class itself then it is called a static method.
Static Methods Description Example isNaN() Determine whether the passed value is NaN(Not a Number) and is of the type “Number”. isFinite() Check whether the passed value is a finite number or not. isInteger() Returns true if the passed value is an integer, otherwise false. isSafeInteger() Check the provided value is a number that is a safe integer. parseFloat() Accept the string and convert it into a floating-point number. parseInt() Manipulate numbers whether it is negative or positive.
- Instance Method: If the method is called on an instance of a number then it is called an instance method.
Instance Methods Description Example toExponential() Returns a string representing the Number object in exponential notation. toFixed() Format a number using fixed-point notation. toLocaleString() Converts a number into a string, using a local language format. toPrecision() Format a number to a specific precision or length. toString() Return a string representing the specified Number object. valueOf() Return the primitive value of a number.
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