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JavaScript - Math.sqrt() method example

16 points
Created by:
Marcin
16180

Math sqrt is static method that returns number which is square root of input value. The method works only on positive real numbers.

// ONLINE-RUNNER:browser;

console.log( Math.sqrt(  4   ) ); //  2
console.log( Math.sqrt(  9   ) ); //  3

console.log( Math.sqrt(  2   ) ); //  1.4142135623730951
console.log( Math.sqrt(  0.5 ) ); //  0.7071067811865476
console.log( Math.sqrt(  0   ) ); //  0
console.log( Math.sqrt( -1   ) ); //  NaN

1. Documentation

SyntaxMath.sqrt(number)
Parametersnumber - integer or float number value in range 0 to +Infinity (primitive value).
Result

Square root number value in range 0 to +Infinity (primitive value).

If operation can not be executed NaN is returned.

Descriptionsqrt is static method that returns number which is square root of input value. The method works only on positive real numbers.

2. Square root with Math.pow method examples

In this example the way how to calculate square root using power function is presented. 

// ONLINE-RUNNER:browser;

function calculateSqrt(value) {
    return Math.pow(value, 0.5);
}

// Examples:

console.log( calculateSqrt(  4   ) ); //  2
console.log( calculateSqrt(  9   ) ); //  3

console.log( calculateSqrt(  2   ) ); //  1.4142135623730951
console.log( calculateSqrt(  0.5 ) ); //  0.7071067811865476
console.log( calculateSqrt(  0   ) ); //  0
console.log( calculateSqrt( -1   ) ); //  NaN

See also

  1. JavaScript - how to calculate root of any degree?

JavaScript - Math (EN)

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