Is there a similar concept to named parameters in AngularJS?

Question

Is there a similar concept to named parameters in AngularJS?

As I delve into learning TypeScript, Angular, and JavaScript simultaneously, I notice interesting patterns in the Angular tutorials.

When looking at their approach in plain JavaScript:

function CreateCtrl($scope, $location, Project){
// do stuff
}

To see a detailed example, visit the "Wire up a backend" project.js sample on the Angular homepage.

The intriguing aspect is how the parameters can be rearranged or omitted completely within the function, with Project being a user-defined entity. The Angular framework seamlessly maps these parameters to actual objects.

This brings me to my query about replicating this behavior in Typescript. How can I mimic Angular's ability to dynamically map parameters while ensuring strong typing for this flexible property injection?

angularjs typescript

Answer 1

Answer №1

If you want to use Angular with TypeScript, there is an AngularJS type definition available on Definitely Typed.

When creating a definition for an existing function without named arguments, one approach could be defining them in a specific order or creating function overloads that match the desired possibilities:

interface Example {
    ($scope: bool, $location: string, Project: number): void;
    ($location: string, $scope: bool, Project: number): void;
    (Project: number, $scope: bool, $location: string): void;
}

declare var example: Example;

This setup provides intellisense options and compiler warnings if an incorrect combination is used when calling example().

In JavaScript, named arguments are typically handled using an object. For a method that accepts arguments in this format, it can be defined as follows:

interface ExampleArguments {
    scope: bool;
    location: string;
    project: number;
}

var example = function (exampleArguments: ExampleArguments) {

};

example({ scope: true, project: 4, location: 'hi' });

Using this structure ensures static typing and checking in TypeScript.

Answer 2

If you want to use Angular with TypeScript, there is an AngularJS type definition available on Definitely Typed.

When creating a definition for an existing function without named arguments, one approach could be defining them in a specific order or creating function overloads that match the desired possibilities:

interface Example {
    ($scope: bool, $location: string, Project: number): void;
    ($location: string, $scope: bool, Project: number): void;
    (Project: number, $scope: bool, $location: string): void;
}

declare var example: Example;

This setup provides intellisense options and compiler warnings if an incorrect combination is used when calling example().

In JavaScript, named arguments are typically handled using an object. For a method that accepts arguments in this format, it can be defined as follows:

interface ExampleArguments {
    scope: bool;
    location: string;
    project: number;
}

var example = function (exampleArguments: ExampleArguments) {

};

example({ scope: true, project: 4, location: 'hi' });

Using this structure ensures static typing and checking in TypeScript.

Is there a similar concept to named parameters in AngularJS?

Answer №1

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