Transitioning my app from AngularJs to Angular 4 has been quite a challenge.
I've noticed that the type of statements I frequently used in my code are now failing in Angular 4 (TypeScript):
Update: The following lines were previously used in AngularJS
var dorm = {};
dorm.DormitoryAddresses = [];
When attempting this in my Angular4 component class:
this.dorm = {};
this.dorm.DormitoryAddresses = [];
An error is thrown: Property DormitoryAddresses does not exist :(
When working with Typescript, the type of a variable can be determined through assignment inference.
If you want to step outside of the type system altogether (although not recommended), you can use the keyword "any":
let lodging: any = {};
lodging.LodgingAddresses = [];
Alternatively, you can explicitly specify the type of the variable:
let lodging: { LodgingAddresses?: any[] } = {}; // using "any," but a more specific type can be used
lodging.LodgingAddresses = [];
You can also utilize a named interface:
interface Lodging { LodgingAddresses?: any[] } // again, using "any" for demonstration purposes
let lodging: Lodging = {};
lodging.LodgingAddresses = [];
If possible, initializing the variable all at once will allow Typescript to infer the correct type:
let lodging = { LodgingAddresses: [] }
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