JavaScript | Math.expm1() function

Math.expm1() is an inbuilt function in JavaScript which 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:

Here p is the parameter and it is any number.

Return Value:

It return the value of e^p-1, where p is any given number as parameter.

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 JavaScript program:

// Here different values is being taken as 
// as parameter of Math.expm1() function. 
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

Error Or NaN:

Here parameter should must be a number otherwise it give error or NaN i.e, not a number.
Code #1:
// Here alphabet parameter give error.

console.log(Math.expm1(C));
Output:
```
Error: C is not defined
```
Code #2:
// 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 Math.expm1() function in JavaScript.
// Here different numbers are being taken as parameter

// from 0 to 9 for Math.expm1() function.

for (i = 0; i < 10; i++) {

console.log(Math.expm1(i));

+"<br>";

}
Output:
```
 0
 1.718281828459045
 6.38905609893065
 19.085536923187668
 53.598150033144236
 147.4131591025766
 402.4287934927351
 1095.6331584284585
 2979.9579870417283
 8102.083927575384
```

My Personal Notes

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