Adding functions to objects and arrays

A variable can be added to any object. Since a function is stored in a variable, it can also be added to objects, as follows:

const myCalculator = {
    bmi: (weight, height) => weight / (height * height)
};

Similarly, we can add it to an array, as follows:

const myCalculator = [
 Bmi => (weight, height) => weight / (height * height)
];