Functions as Methods

functions_as_methods.js

var counter = {
    value: 0,
    increment: function () {
        this.value += 1;
    },
    reset: function () {
        this.value = 0;
    }
};

console.log(counter.value); // 0

counter.increment();
counter.increment();
counter.increment();

console.log(counter.value); // 3

counter.reset();

console.log(counter.value); // 0