What is Math.log2() in JavaScript?

Math is a built-in object in JavaScript that contains different methods and properties used to perform mathematical operations. It contains a log2() function, which is used to compute the base 2 logarithm of a specified number.

Syntax

Math.log2(param);

Parameter

  • param: This is the input value of the type Number, for which we want to find log2().

Number in JavaScript is a 64-bit double-precision value that is the same as double in C# or Java.

Return value

  • Number: It returns the base 2 logarithm of the input parameter param. It is of Number type.

  • -Infinity: The function returns this if the input parameter param = 0.

  • +Infinity: The function returns this if the input parameter param = Infinity.

  • NaN: The function returns this if the input parameter param < 0.

Example

console.log("log2(-1) = " + Math.log2(-1));
console.log("log2(0) = " + Math.log2(0));
console.log("log2(1) = " + Math.log2(1));
console.log("log2(20) = " + Math.log2(20));
console.log("log2(∞) = " + Math.log2(Infinity));
console.log("log2(-∞) = " + Math.log2(-Infinity));

Output

  • log2 ( -1 ) = NaN
  • log2 ( 0 ) = -Infinity
  • log2 ( 1 ) = 0
  • log2 ( 20 ) = 4.321928094887363
  • log2 ( ∞ ) = Infinity
  • log2 ( -∞ ) = NaN

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