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# JavaScript Math.log1p() Method

• Last Updated : 29 Dec, 2022

The Javascript Math.log1p() is an inbuilt function in JavaScript that gives the value of the natural logarithm of 1 + p number. The natural logarithm is of base e, where e is an irrational and transcendental number approximately equal to 2.718.

Syntax:

`Math.log1p(1 + p)`

Let’s see some JavaScript code on this function:

Example 1: In this example, we will find the logarithms of some basic numbers.

## javascript

 ``

Output:

```6.90875477931522
2.5649493574615367
3.295836866004329
1.791759469228055```

Example 2: In this example, we will use a for loop to get the logarithms of numbers from 1 to 19 with an increment of 3.

## javascript

 ``

Output:

```0.6931471805599453
1.6094379124341003
2.0794415416798357
2.3978952727983707
2.639057329615259
2.833213344056216
2.995732273553991```

Errors and exceptions: Parameters for this function should always be a number otherwise it returns NaN i.e, not a number when its parameter is taken as a string.

Example 1: Here NaN comes in output as we have passed a string in the Math.log1p() function.

## javascript

 ``

Output:

` NaN`

Example 2: This function gives an error when its parameter is taken as a complex number because it accepts only integer value as the parameter.

## javascript

 ``

Output:

`Error: Invalid or unexpected token`

Example 3: This function returns NaN i.e, not a number if the parameter is less than -1 because the number should be any positive number i.e, greater than 0.

## javascript

 ``

• Output:
` NaN`

We have a complete list of Javascript Math Object methods, to check those please go through Javascript Math Object Complete reference article.

Supported Browsers: The browsers supported by JavaScript Math.log1p( ) function are listed below:

• Google Chrome 38 and above
• Edge 12 and above
• Firefox 25 and above
• Opera 25 and above
• Safari 8 and above

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