blimpy

If you need to quickly assign a prototype to an object,
such as one from a database, blimpy is the best way to do it.

Why?

Most databases don't store an object's prototype. This means if you're doing something like

firebaseRef.set(someFoodObject);

and then retrieving it later, it won't have the methods from FoodClass.

What should you do?

• Using Object.setPrototypeOf is terrible for performance.
• A combination of Object.assign and Object.create is ugly if you're doing it over and over again.
• Object.create and Object.getOwnPropertyDescriptors is even worse.

Using blimpy makes it easy to add a prototype to an object.

• blimpy is small (blimpy.min.js is less than 400 bytes).
• blimpy is simple (blimpy only uses 2 built-in JS functions).
• blimpy is well-tested (blimpy has 16 tests using MochaJS)

Sample Usage

1. Get some object. It doesn't matter where from.

   • …from a database…

     let foodObject = getFoodObjectFromDatabase('apple');
     

   • …or with an object literal…

     let foodObject = { name: 'apple', price: 5 };
     

2. Use blimpy.

   let food = blimpy.withClass(FoodClass, foodObject);
   

3. Profit. (Use the class's methods.)

   food.eat();
   console.log(food.getPriceStr());
   

Install

npm install --save blimpy

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Full Docs

withClass

Adds a class's prototype to an object (without mutating it).

blimpy.withClass(someClass, someObject)

• someClass: The class to add.
• someObject: The object to add it to.
• Returns: The new object with the class's prototype.

withProto

Adds a prototype to an object (without mutating it).

blimpy.withProto(someProto, someObject)

• someClass: The prototype to add.
• someObject: The object to add it to.
• Returns: The new object with the prototype.

withNoClass

Removes an object's prototype (without mutating it). Actually, this sets the object's prototype to Object.prototype (the default object prototype).

blimpy.withNoClass(someObject)

• someObject: The object to remove the class from.
• Returns: The new object without a prototype.

withNoProto

Removes an object's prototype (without mutating it). Unlike withNoClass, this sets the prototype of the object to null, not Object.prototype. For example, this means that blimpy.withNoClass(someObject).toString() works but blimpy.withNoProto(someObject).toString() does not.

blimpy.withNoClass(someObject)

• someObject: The object to remove the class from.
• Returns: The new object without a prototype.

Full Example File

// Require blimpy.
let blimpy = require('blimpy');

// Some arbitrary class.
class FoodClass {
    constructor(name) {
        this.name = name;
        this.price = name.length;
    }

    getPriceStr() {
        return '$' + this.price.toString();
    }
}

// Some food object without the `FoodClass` prototype, in this case
// an object literal.
let foodObject = {
    name: 'apple',
    price: 5,
}

// Add the prototype with blimpy.
let food = blimpy.withClass(FoodClass, foodObject);

// Logs `$5`.
console.log(food.getPriceStr());