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JavaScript - Math.sqrt() method example
16
points
Math sqrt is a static method that returns a number which is the square root of an 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
| Syntax | Math.sqrt(number) |
| Parameters | number - integer or float number value in the range 0 to +Infinity (primitive value). |
| Result |
Square root If the operation can not be executed |
| Description | sqrt is a static method that returns a number which is the square root of the 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 the power function is presented.
// ONLINE-RUNNER:browser;
function calculateSqrt(value) {
return Math.pow(value, 0.5);
}
// Usage 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