You can implement this as a pure Javascript function:
function scale (number, inMin, inMax, outMin, outMax) {
return (number - inMin) * (outMax - outMin) / (inMax - inMin) + outMin;
}
Use the function, like this:
const num = 5;
console.log(scale(num, 0, 10, -50, 50)); // 0
console.log(scale(num, -20, 0, -100, 100)); // 150
I’m using scale
for the function name, because map
is frequently associated with iterating over arrays and objects.