Math.pow()
The Math.pow() static method, given two arguments, base and exponent, returns baseexponent.
Syntax
Math.pow(base, exponent)
Parameters
base-
The base number.
exponent-
The exponent used to raise the
base.
Return value
A number representing the given base taken to the power of the given exponent.
Description
The Math.pow() function returns the
base to the exponent power, as in
base^exponent, the base and the
exponent are in decimal numeral system.
Because pow() is a static method of Math, use it
as Math.pow(), rather than as a method of a Math object you
created. (Math has no constructor.) If the base is negative and the exponent
is not an integer, the result is NaN.
Examples
Using Math.pow()
// simple
Math.pow(7, 2); // 49
Math.pow(7, 3); // 343
Math.pow(2, 10); // 1024
// fractional exponents
Math.pow(4, 0.5); // 2 (square root of 4)
Math.pow(8, 1/3); // 2 (cube root of 8)
Math.pow(2, 0.5); // 1.4142135623730951 (square root of 2)
Math.pow(2, 1/3); // 1.2599210498948732 (cube root of 2)
// signed exponents
Math.pow(7, -2); // 0.02040816326530612 (1/49)
Math.pow(8, -1/3); // 0.5
// signed bases
Math.pow(-7, 2); // 49 (squares are positive)
Math.pow(-7, 3); // -343 (cubes can be negative)
Math.pow(-7, 0.5); // NaN (negative numbers don't have a real square root)
// due to "even" and "odd" roots laying close to each other,
// and limits in the floating number precision,
// negative bases with fractional exponents always return NaN
Math.pow(-7, 1/3); // NaN
Specifications
| Specification |
|---|
| ECMAScript Language Specification # sec-math.pow |
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