Math.log2() - JavaScript | MDN
Try it
console.log(Math.log2(3));
// Expected output: 1.584962500721156
console.log(Math.log2(2));
// Expected output: 1
console.log(Math.log2(1));
// Expected output: 0
console.log(Math.log2(0));
// Expected output: -Infinity
Syntax
Parameters
x-
A number greater than or equal to 0.
Return value
The base 2 logarithm of x. If x < 0, returns NaN.
Description
Because log2() is a static method of Math, you always use it as Math.log2(), rather than as a method of a Math object you created (Math is not a constructor).
This function is the equivalent of Math.log(x) / Math.log(2). For log2(e), use the constant Math.LOG2E, which is 1 / Math.LN2.
Examples
Using Math.log2()
js
Math.log2(-2); // NaN
Math.log2(-0); // -Infinity
Math.log2(0); // -Infinity
Math.log2(1); // 0
Math.log2(2); // 1
Math.log2(3); // 1.584962500721156
Math.log2(1024); // 10
Math.log2(Infinity); // Infinity
Specifications
| Specification |
|---|
| ECMAScript® 2027 Language Specification # sec-math.log2 |