JavaScript Math.cbrt() Method

1. Syntax of JavaScript Math.cbrt() Method
2. Example 1: Use the Math.cbrt() Method to Get Cubic Root of a Number
3. Example 2: Use Math.cbrt() to Get and Compare Cubic Root of Numbers
4. Example 3: Use Math.cbrt() on a NEGATIVE_INFINITY Value
5. Example 4: Use Math.cbrt() on a null Value

The Math.cbrt() method takes any number to find its cubic root. In JavaScript, cbrt is a static method and can only be used for Math objects.

Syntax of JavaScript Math.cbrt() Method

Math.cbrt(x);

Parameters

Return

This method calculates and returns the cubic root of a number.

Example 1: Use the Math.cbrt() Method to Get Cubic Root of a Number

We use the method Math.cbrt() to get the cubic root of a number in JavaScript. In the example below, we got 125 by multiplying 5*5*5.

Then, we used the Math.cbrt() method to check that 5 is the cubic root of the number 125.

let cbrt = 5;
let num = cbrt*cbrt*cbrt;
console.log(num);
console.log(Math.cbrt(125));

Output:

125
5

Example 2: Use Math.cbrt() to Get and Compare Cubic Root of Numbers

We get the cubic root of negative and positive numbers using the Math.cbrt() method. In this example, we have used the cbrt() method to get the cubic root of -8 and 8.

let cbrt = Math.cbrt(-8);
let cb = Math.cbrt(8);
console.log(cbrt);
console.log(cb);

Output:

-2
2

Example 3: Use Math.cbrt() on a NEGATIVE_INFINITY Value

When we pass the NEGATIVE_INFINITY as a parameter of the Math.cbrt() method, it always returns the -Infinity value that users can observe in the output of the example below.

let value = -Infinity;
let cbrt = Math.cbrt(value);
console.log(cbrt);

Output:

-Infinity

Example 4: Use Math.cbrt() on a null Value

In the example below, we have tried to use different values as a parameter of the Math.cbrt() method.

Users can see that Math.cbrt() returns 0 for the empty string "" and null values. The method returns NaN for the undefined variables, which represent Not a Number in JavaScript.

let val1;
let val2 = null;
let cbrt = Math.cbrt(val1);
let cb = Math.cbrt(val2);
console.log(cbrt);
console.log(cb);
console.log(Math.cbrt(undefined));
console.log(Math.cbrt(""));

Output:

NaN
0
NaN
0

The Math.cbrt() method is supported in all browsers of the current version.