TypeScript 中 Angular 2 的最佳实践

Question

I'm trying to rewrite my app in Angular 2 typescript and would like to use best practices. I've found the following guide but it doesn't answer my very basic questions. Here is two questions:

1. In Components, is it ok to declare a local variable inside a function or should I declare it as private, right above the constructor?

2. How should I call variables inside nested functions? For example:

    replicator(){// return observable} myFunction(){// Nested function to be called} ngOnInit() { this.replicator().subscribe(function (data) { // Call function here } }

   Should I call my function by doing: let self = this before this.replicator() and then call self.myFunction() ? Or is there a better way to do this?

PS If you have a good best practice guide, please post it as a comment!

Answer 1

How should I call variables inside nested functions

Use an arrow function ( more ).

ngOnInit() {
    this.replicator().subscribe((data) => {
        // Call function here
        this.somefunction
    }
}

is it ok to declare a local variable inside a function or should I declare it as private, right above the constructor

Both are fine. Local if its only local to the function or private if other functions might need it 🌹