JavaScript Square Roots: A Beginner’s Guide to Math.sqrt() Discover the power of calculating square roots in JavaScript with the built-in `Math.sqrt()` method. Learn how to use it, its syntax, and the rules for getting accurate results.

Unlocking the Power of Square Roots in JavaScript

When working with numbers in JavaScript, being able to calculate square roots is an essential skill. Whether you’re a seasoned developer or just starting out, understanding how to harness the power of square roots can elevate your coding game.

The Math Behind the Magic

To find the square root of a number in JavaScript, you can utilize the built-in Math.sqrt() method. This powerful function takes a single argument – a number – and returns its square root. The syntax is straightforward: Math.sqrt(number).

Putting it into Practice

Let’s dive into some examples to see how Math.sqrt() works its magic. In our first example, we’ll calculate the square root of a simple number:


console.log(Math.sqrt(16)); // Output: 4


But what happens when we pass in different data types? Let’s explore:


console.log(Math.sqrt(-1)); // Output: NaN
console.log(Math.sqrt("four")); // Output: NaN


As we can see, if we pass a negative number or a string into the Math.sqrt() method, it returns NaN (Not a Number).

Understanding the Rules

So, what are the rules for using Math.sqrt()? Here’s a quick rundown:

• If you pass 0 or a positive number, the method returns the square root of that number.
• If you pass a negative number, the method returns NaN.
• If you pass a string, the method returns NaN.

By mastering the Math.sqrt() method, you’ll be able to tackle a wide range of mathematical challenges in JavaScript. Want to take your skills to the next level? Check out our article on solving quadratic equations in JavaScript!