maybify v0.0.1

maybify returns an object proxy that wraps existing methods of the object in conditional maybe* wrappers.

This can be useful when using a Builder design pattern with optional flags.

For example, the following builder:

let pizzaBuilder = new PizzaBuilder()
	.addDough()
	.addSauce();
if ( addCheese ) {
	pizzaBuilder = pizzaBuilder.addCheese(10);
}
if ( addPepperoni ) {
	pizzaBuilder = pizzaBuilder.addPepperoni(5);
}
if ( addBacon ) {
	pizzaBuilder = pizzaBuilder.addBacon();
}
const pizza = pizzaBuilder.bake();

can be reimplemented with maybify:

const pizza = maybify(new PizzaBuilder())
	.addDough()
	.addSauce()
	.maybeAddCheese(addCheese, 10) // addCheese is passed as a flag
	.maybeAddPepperoni(() => addPepperoni, 5) // addPepperoni is passed as a predicate
	.maybeAddBacon(() => addBacon)
	.bake();

Another example is a RethinkDB ReQL query expression builder:

return maybify(r.table('users'))
	.filter({ status: 'active' })
	.maybeSlice(() => sliced, begin, end)
	.maybeOrderBy(() => ordered, 'name')
	.run(connection);