Math

`Math.log2`

Returns the base 2 logarithm of a number

Syntax

JavaScript

Math.log2(x)

Parameters

Parameter	Type	Description
x	number	A positive number

Return Value

The base 2 logarithm of x

Examples

Basic Usage

console.log(Math.log2(8)); // 3
console.log(Math.log2(1024)); // 10

Practical Example

function isPowerOfTwo(n: number) {
  return Math.log2(n) % 1 === 0;
}
console.log(isPowerOfTwo(64)); // true
console.log(isPowerOfTwo(100)); // false

Advanced Usage

console.log(Math.log2(1)); // 0
console.log(Math.log2(0.5)); // -1

Understanding Math.log2

The Math.log2 method in JavaScript returns the base 2 logarithm of a number. It belongs to the Math object and is one of the most widely used methods for working with math values in modern JavaScript and TypeScript applications.

The method signature is Math.log2(x). It accepts 1 parameter: x. When called, it returns the base 2 logarithm of x. Understanding when and how to use log2() helps you write more expressive, readable code.

Common use cases for Math.log2 include data transformation, input validation, API response processing, and building reusable utility functions. It works well alongside related methods like math-log, math-log10, enabling you to chain operations together for complex data manipulation pipelines.

Browser support for Math.log2 is excellent across all modern browsers including Chrome, Firefox, Safari, and Edge. It is also fully supported in Node.js and Deno. For older environments, transpilation with Babel or a polyfill may be needed.