Linear remapping in JavaScript. When n, a and b are equal, x will be returned instead of NaN (Due to divide by zero)

remap.js

const remap = (n, a, b, x, y) => x + (y - x) * (n - a) / (b - a) || x

/*
	Usage:
	n = Number
	a = from lower bound
	b = from upper bound
	x = to lower bound
	y = to upper bound
	
	Note:
	Will return `x` if `n`, `a` and `b` are equal
*/
remap(5, 0, 10, 0, 1) // Returns 0.5