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# JavaScript Math log1p() Method

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)`

Below example illustrate the JavaScript Math.log1p() Method in JavaScript:

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

## javascript

 `// Different numbers are being taken``// as the parameter of the function.``console.log(Math.log1p(1000));``console.log(Math.log1p(12));``console.log(Math.log1p(26));``console.log(Math.log1p(5));`

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

 `// Taken parameter from 1 to 19 incremented by 3.``for` `(i = 1; i < 20; i += 3) {``    ``console.log(Math.log1p(i));``}`

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

 `// Parameters for this function should always be a``// number otherwise it return NaN i.e, not a number``// when its parameter taken as string.``console.log(Math.log1p(``"gfg"``));`

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

 `// Parameters can never be a complex number because``// it accept only integer value as the parameter.``console.log(Math.log1p(1 + 2i));`

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

 `// This function return NaN i.e, not a number``// if the parameter is less``// than -1 because number should be``// any positive number i.e, greater than 0.``console.log(Math.log1p(-2));`

Output:

` NaN`

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

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