JavaScript Number Properties

In this tutorial, you'll learn about various number properties in JavaScript.

JavaScript Number.EPSILON

Number.EPSILON represents the smallest possible difference between 1 and the next larger floating-point number.

const epsilon = Number.EPSILON;
console.log(epsilon);
// Output: 2.220446049250313e-16

Note: Number.EPSILON is an ES6 feature and is not supported in older browsers like Internet Explorer.

JavaScript MAX_VALUE

Number.MAX_VALUE holds the largest numerical value representable in JavaScript.

const maxValue = Number.MAX_VALUE;
console.log(maxValue);
// Output: 1.7976931348623157e+308

Important: Number properties cannot be used on variables.

let num = 6;
console.log(num.MAX_VALUE);
// Output: undefined

JavaScript MIN_VALUE

Number.MIN_VALUE represents the smallest positive number in JavaScript.

const minValue = Number.MIN_VALUE;
console.log(minValue);
// Output: 5e-324

JavaScript MAX_SAFE_INTEGER

Number.MAX_SAFE_INTEGER is the highest integer that JavaScript can accurately represent (2^53 - 1).

const maxSafeInt = Number.MAX_SAFE_INTEGER;
console.log(maxSafeInt);
// Output: 9007199254740991

JavaScript MIN_SAFE_INTEGER

Number.MIN_SAFE_INTEGER is the smallest reliably representable integer.

const minSafeInt = Number.MIN_SAFE_INTEGER;
console.log(minSafeInt);
// Output: -9007199254740991

Note: These properties were introduced in ECMAScript 2015 (ES6) and are not available in older browsers.

JavaScript POSITIVE_INFINITY

Number.POSITIVE_INFINITY represents a mathematical infinity.

const positiveInfinity = Number.POSITIVE_INFINITY;
console.log(positiveInfinity);
// Output: Infinity

Example: Overflowing a number calculation.

const result = 1 / 0;
console.log(result);
// Output: Infinity

JavaScript NEGATIVE_INFINITY

Number.NEGATIVE_INFINITY represents an infinitely small value.

const negInfinity = Number.NEGATIVE_INFINITY;
console.log(negInfinity);
// Output: -Infinity

Example: Underflowing a numerical computation.

const result = -1 / 0;
console.log(result);
// Output: -Infinity

JavaScript NaN (Not-a-Number)

NaN is used to represent an invalid number.

const invalidNumber = Number.NaN;
console.log(invalidNumber);
// Output: NaN

Example: Arithmetic operations with non-numeric values return NaN.

const result = 100 / "Apple";
console.log(result);
// Output: NaN

By understanding these Number properties, developers can better handle numeric values, detect overflows, and ensure precision in JavaScript applications.