JavaScript/Maths/Signum.js at master · TheAlgorithms/JavaScript · GitHub

25 lines (20 loc) · 665 Bytes

A program to demonstrate the implementation of the signum function,

also known as the sign function, in JavaScript.

The signum function is an odd mathematical function, which returns the

sign of the provided real number.

It can return 3 values: 1 for values greater than zero, 0 for zero itself,

and -1 for values less than zero

Wikipedia: https://en.wikipedia.org/wiki/Sign_function

/**

* @param {Number} input

* @returns {-1 | 0 | 1 | NaN} sign of input (and NaN if the input is not a number)

function signum(input) {

if (input === 0) return 0

if (input > 0) return 1

if (input < 0) return -1

return NaN

}

export { signum }

Expand file tree