What is Math.expm1() in JavaScript?

Math is a built-in object in JavaScript that contains different methods and properties used to perform mathematical operations. It contains the expm1() function, which is used to compute e raised to the power of a specified number - 1.

Syntax

Math.expm1(param);

Parameter

  • param: This is the input value of type Number for which we want to find the expm1().

Number in JavaScript is a 64-bit double-precision value which is the same as double in C# or Java.

Return value

  • Number: It returns e^param - 1 where param is the input value. It is of type Number.

  • Infinity: The function returns this if input param is equal to Infinity.

e is called the Euler number, and has a value of approximately 2.71828.

Example

console.log("expm1(-1) = " + Math.expm1(-1));
console.log("expm1(0) = " + Math.expm1(0));
console.log("expm1(∞) = " + Math.expm1(Infinity));
console.log("expm1(2) = " + Math.expm1(2));
console.log("expm1(-2) = " + Math.expm1(-2));
console.log("expm1(e) = " + Math.expm1(Math.E));
console.log("expm1(1) = " + Math.expm1(1));

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