JavaScript Tutorial JavaScript Resources
Python Java C++ C C# PHP R SQL DS Algo InterviewQ

JavaScript - Math.log1p() Method



The JavaScript Math.log1p() method returns the natural logarithm of (1 + number), i.e., log(1+number).

Syntax

Math.log1p(x);

Parameters

x Specify the number.

Return Value

Returns the natural logarithm of (1 + x), i.e., log(1+x).
If the x is less than -1, it returns NaN.
If the x is -1, it returns -Infinity.

Example:

In the example below, Math.log1p() method is used to calculate the log(1+number).

var txt;

txt = "Math.log1p(0) = " + Math.log1p(0) + "<br>";
txt = txt + "Math.log1p(10) = " + Math.log1p(10) + "<br>";
txt = txt + "Math.log1p(50) = " + Math.log1p(50) + "<br>";
txt = txt + "Math.log1p(-1) = " + Math.log1p(-1) + "<br>";
txt = txt + "Math.log1p(-2) = " + Math.log1p(-2) + "<br>";

The output (value of txt) after running above script will be:

Math.log1p(0) = 0
Math.log1p(10) = 2.3978952727983707
Math.log1p(50) = 3.9318256327243257
Math.log1p(-1) = -Infinity
Math.log1p(-2) = NaN

❮ JavaScript - Math Object

5