The Math.pow()
function returns the base
to the exponent
power, that is, baseexponent
.
Math.pow(base, exponent)
base
exponent
base
.Because pow()
is a static method of Math
, you always use it as Math.pow()
, rather than as a method of a Math
object you created (Math
is no constructor).
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
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