JavaScript Math.expm1()
Syntax & Examples

Math.expm1() static-method

The Math.expm1() method in JavaScript returns e raised to the power of a given number (x), minus 1. This is equivalent to Math.exp(x) - 1, where e is Euler's number (approximately 2.718). It is a static method of Math, meaning it is always used as Math.expm1() and not as a method of a Math object created (Math is not a constructor).

Syntax of Math.expm1()

The syntax of Math.expm1() static-method is:

Math.expm1(x)

This expm1() static-method of Math returns e^x - 1, where x is the argument, and e is Euler's number (2.718…, the base of the natural logarithm).

Parameters

ParameterOptional/RequiredDescription
xrequiredA number representing the exponent to raise e to, before subtracting 1.

Return Type

Math.expm1() returns value of type Number.


✐ Examples

1 Using Math.expm1() with a positive number

In this example, we use the Math.expm1() method to calculate e raised to the power of 1, minus 1.

For example,

  1. We call Math.expm1() with 1 as the argument.
  2. The method returns e raised to the power of 1, minus 1.
  3. We log the result to the console using console.log().

JavaScript Program

console.log(Math.expm1(1));

Output

1.718281828459045

2 Using Math.expm1() with zero

In this example, we use the Math.expm1() method to calculate e raised to the power of 0, minus 1.

For example,

  1. We call Math.expm1() with 0 as the argument.
  2. The method returns e raised to the power of 0, minus 1.
  3. We log the result to the console using console.log().

JavaScript Program

console.log(Math.expm1(0));

Output

0

3 Using Math.expm1() with a negative number

In this example, we use the Math.expm1() method to calculate e raised to the power of -1, minus 1.

For example,

  1. We call Math.expm1() with -1 as the argument.
  2. The method returns e raised to the power of -1, minus 1.
  3. We log the result to the console using console.log().

JavaScript Program

console.log(Math.expm1(-1));

Output

-0.6321205588285577

Summary

In this JavaScript tutorial, we learned about expm1() static-method of Math: the syntax and few working examples with output and detailed explanation for each example.