JavaScript Math expm1()

The JavaScript Math.expm1() function returns e (Euler's number) raised to given power minus 1.

It is equivalent to ex - 1 in mathematics.

The syntax of the Math.expm1() function is:

Math.expm1(x)

expm1(), being a static method, is called using the Math class name.


Math.expm1() Parameters

The Math.expm1() function takes in:

  • x - A number

Return value from Math.expm1()

  • Returns ex - 1 for argument x, where e is Euler's number (2.71828).

Example: Using Math.expm1()

// Math.expm1() is equivalent to e**x-1

var value = Math.expm1(0);
console.log(value); // 0

var value = Math.expm1(1);
console.log(value); // 1.718281828459045

var value = Math.expm1("2");
console.log(value); // 6.38905609893065

var value = Math.expm1(-1);
console.log(value); // -0.6321205588285577

Output

0
1.718281828459045
6.38905609893065
-0.6321205588285577

Note: Use the constant Math.E to get the approximate value of e.


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