JavaScript Math log1p() Method (original) (raw)

Last Updated : 12 Jul, 2024

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:

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