Math.pow()
The Math.pow() static method, given two arguments, base and exponent, returns baseexponent.
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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
baseexponent, 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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