JavaScript Math.sqrt()

Math.sqrt(x) returns the non-negative square root of a number. A negative input has no real square root, so JavaScript returns NaN.

console.log(Math.sqrt(64)); // 8
console.log(Math.sqrt(-1)); // NaN

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Math.sqrt() syntax Top ↑

Math.sqrt(x)

Square-root examples Top ↑

console.log(Math.sqrt(4));  // 2
console.log(Math.sqrt(64)); // 8
console.log(Math.sqrt(9));  // 3
console.log(Math.sqrt(27)); // 5.196152422706632

Fractions and decimal values Top ↑

console.log(Math.sqrt(0.36)); // 0.6
console.log(Math.sqrt(0));    // 0

Negative numbers return NaN Top ↑

console.log(Math.sqrt(-64)); // NaN
console.log(Number.isNaN(Math.sqrt(-9))); // true

Math.sqrt() vs powers Top ↑

console.log(Math.sqrt(81));  // 9
console.log(81 ** 0.5);          // 9

Distance example Top ↑

const x = 3;
const y = 4;
const distance = Math.sqrt(x ** 2 + y ** 2);
console.log(distance); // 5

Math.exp() →

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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