JavaScript Math.log2()

// calculate the base 2 log of 2
let value= Math.log2(2);

console.log(value)

// Output: 1

log2() Syntax

The syntax of log2() is:

Math.log2(x)

Here, log2() is a static method. Hence, we need to access the method using the class name, Math.

log2() Parameters

The log2() method takes in:

• x - a number

log2() Return Values

The log2() method returns:

• the base 2 logarithm of the given number.
• NaN for negative numbers and non-numeric arguments.

Example 1: JavaScript Math.log2()

// find the base 2 log value of 1
var value1 = Math.log2(1);
console.log(value1); 

// find the base 2 log value of 8
var value2=Math.log2(8);
console.log(value2)

Output

0
3

In the above example,

• Math.log2(1) - computes the base 2 log value of 1
• Math.log2(8) - computes the base 2 log value of 8

Example 2: log2() With 0

 
// find the base 2 log value of 0
var value = Math.log2(0);

console.log(value);

// Output: -Infinity

In the above example, we have used the log2() method to compute the base 2 log value of 0.

The output -Infinity indicates that the base 2 log value of 0 is negative infinity.

Example 3: log2() With Negative Values

// find the base 2 log value of -1
var value = Math.log2(-1);

console.log(value); 

// Output: NaN

In the above example, we have used the log2() method to compute the base 2 log value of a negative number.

The output NaN stands for Not a Number. We get this result because the base 2 log value of negative numbers is undefined.

Recommended Readings:

• Math.log()
• Math.log10()