mirror of
https://github.com/TheAlgorithms/JavaScript.git
synced 2025-07-04 07:29:47 +08:00
86d333ee94
* chore: Switch to Node 20 + Vitest * chore: migrate to vitest mock functions * chore: code style (switch to prettier) * test: re-enable long-running test Seems the switch to Node 20 and Vitest has vastly improved the code's and / or the test's runtime! see #1193 * chore: code style * chore: fix failing tests * Updated Documentation in README.md * Update contribution guidelines to state usage of Prettier * fix: set prettier printWidth back to 80 * chore: apply updated code style automatically * fix: set prettier line endings to lf again * chore: apply updated code style automatically --------- Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com> Co-authored-by: Lars Müller <34514239+appgurueu@users.noreply.github.com>
26 lines
665 B
JavaScript
26 lines
665 B
JavaScript
/*
|
|
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 }
|