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egghead.io lesson 1: observable & observer</a> egghead.io lesson 4: observable objects & maps

Decorator that can be used on ES7- or TypeScript class properties to make them observable. The @observable can be used on instance fields and property getters. This offers fine-grained control on which parts of your object become observable.

import { observable, computed } from "mobx";

class OrderLine {
    @observable price = 0;
    @observable amount = 1;

    @computed get total() {
        return this.price * this.amount;

If your environment doesn't support decorators or field initializers, use decorate instead (see decorators for details).