JavaScript Math expm1() Method

Math.expm1() is an inbuilt method in JavaScript that is used to get the value of e^p-1, where p is any given number. The number e is a mathematical constant having an approximate value equal to 2.718. It was discovered by the Swiss mathematician Jacob Bernoulli. This number is also called Euler’s number. 

Syntax:

Math.expm1(p)

Parameter:

• p: This parameter holds the number where we will perform the expm1 method.

Example:

Input  :Math.expm1(0)
Output : 0

Explanation: Here the value of parameter p is 0, So after putting the value 0 instead of p in e^p-1 then its value becomes 0. Let’s see the JavaScript program:

Example 1: In this example, we will use Math expm1() Method

javascript

// Here different values is being taken as
// as parameter of Math.expm1() method.
console.log(Math.expm1(0));
console.log(Math.expm1(1));
console.log(Math.expm1(2));
console.log(Math.expm1(-1));
console.log(Math.expm1(5));
console.log(Math.expm1(2.2));
console.log(Math.expm1(-3.2));

Output

0
1.718281828459045
6.38905609893065
-0.6321205588285577
147.4131591025766
8.025013499434122
-0.9592377960216338

Example 2: Error, here parameter should be a number otherwise it gives an error or NaN i.e., not a number. 

javascript

// Here alphabet parameter give error.
console.log(Math.expm1(C));

Output:

Error: C is not defined

Example 3: Here parameter as a string give NaN.

javascript

// Here parameter as a string give NaN.
console.log(Math.expm1("geeksforgeeks"));

Output:

NaN

Application:

Whenever we need to find the value of e^p-1, where p is any given number that time we take the help of the Math.expm1() method in JavaScript.

Example: In this example, we will see the application of Math expm1() Method

javascript

// Here different numbers are being taken as parameter
// from 0 to 9 for Math.expm1() method.
for (i = 0; i < 10; i++) {
    console.log(Math.expm1(i));
}

Output

0
1.718281828459045
6.38905609893065
19.085536923187668
53.598150033144236
147.4131591025766
402.4287934927351
1095.6331584284585
2979.9579870417283
8102.083927575384

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

Supported Browsers: The browsers supported by JavaScript Math.expm1() method are listed below:

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