normalize - nodef/extra-number GitHub Wiki
Normalize a number from its current range into a value between 0 and 1.
function normalize(x, r, R)
// x: a number
// r: lower bound of current range
// R: upper bound of current range
const xnumber = require('extra-number');
xnumber.normalize(20, 0, 50);
// → 0.4
xnumber.normalize(-10, 0, 100);
// → -0.1