The Number object in JavaScript is a global object and constructor function that represents numerical values. It provides properties and methods for working with numbers in JavaScript.
1. Creating Number Objects:
- You can create a
Numberobject using theNumber()constructor:
const num = new Number(42);
However, it’s more common to use primitive number literals:
const num = 42;
2. Properties of Number Object:
Number.MAX_VALUE: Returns the largest representable number in JavaScript.Number.MIN_VALUE: Returns the smallest positive representable number in JavaScript.Number.NaN: Represents “Not-A-Number” value.Number.NEGATIVE_INFINITY: Represents negative infinity.Number.POSITIVE_INFINITY: Represents positive infinity.
3. Methods of Number Object:
.toString(): Converts a number to a string..toFixed(): Formats a number using fixed-point notation..toPrecision(): Formats a number to a specified precision in scientific notation..valueOf(): Returns the primitive value of aNumberobject..parseInt(): Parses a string and returns an integer..parseFloat(): Parses a string and returns a floating-point number.
const num = 42.555;
console.log(num.toFixed(2));
// Outputs: 42.56
console.log(num.toPrecision(3));
// Outputs: 42.6e+0
console.log(num.toString());
// Outputs: "42.555"
console.log(num.valueOf());
// Outputs: 42.555
console.log(Number.parseInt("10"));
// Outputs: 10
console.log(Number.parseFloat("3.14"));
// Outputs: 3.14
Static Methods of Number Object:
Number.isFinite(): Checks whether a value is a finite number.Number.isInteger(): Checks whether a value is an integer.Number.isNaN(): Checks whether a value isNaN.Number.isSafeInteger(): Checks whether a value is a safe integer.
console.log(Number.isFinite(42));
// Outputs: true
console.log(Number.isInteger(42));
// Outputs: true
console.log(Number.isNaN(42));
// Outputs: false
console.log(Number.isSafeInteger(42));
// Outputs: true
