Composing Software: An Introduction 9
The most common form of object composition in JavaScript is known as object concatenation
(aka, concatenative inheritance: informally, “mixin composition”). It works like ice-cream. You
start with an object (like vanilla ice-cream), and then mix in the features you want. Add some nuts,
caramel, chocolate swirl, and you wind up with nutty caramel chocolate swirl ice cream.
Building composites with class inheritance:
1 class Foo {
2 constructor () {
3 this.a = 'a'
4 }
5 }
6
7 class Bar extends Foo {
8 constructor (options) {
9 super(options);
10 this.b = 'b'
11 }
12 }
13
14 const myBar = new Bar(); // {a: 'a', b: 'b'}
Building composites with mixin composition:
1 const a = {
2 a: 'a'
3 };
4
5 const b = {
6 b: 'b'
7 };
8
9 const c = {...a, ...b}; // {a: 'a', b: 'b'}
We’ll explore other styles of object composition in more depth later. For now, your understanding
should be:
1. There’s more than one way to do it.
2. Some ways are better than others.
3. You want to select the simplest, most flexible solution for the task at hand.
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