Map all the Math functions to immutable properties directly on another object

math-constants.js

function addMathTo(obj) {
  Object.getOwnPropertyNames(Math).forEach((prop) => {
    let constName = String(prop).toUpperCase();
    Object.defineProperty(obj, constName, {
      value: Math[prop],
      writable: false,
      configurable: false
    });
  });
}

// USE
addMathTo(window);
FLOOR(9.5) // => 9
CEIL(9.5) // => 10