Argument of type 'X' is not assignable to parameter of type 'X'

Question

Good day. I'm new to Type Script, using VSCode.

Getting following errors:

1. error TS2322: Type '() => string' is not assignable to type 'string'.

2. error TS2322: Type '() => number' is not assignable to type 'number'.

The Code:

DTO.ts

interface DTO {      getId(): number;     getValue(): string; } export = DTO; 

LinkedObject.ts

class LinkedObject {      public value: string = "Not Set";     public id: number = 0;      constructor(value?: string, id?: number) {         this.value = value;         this.id = id;     } } export = LinkedObject; 

I am trying to instantiate LinkedObject class using above mentioned interface methods:

TravelClientFormPopulator.ts

class TravelClientFormPopulator {      public populateComboBoxUsingDTOs(dataObjects: Array<DTO>, comboBoxID: string): void {          // Get the combo box         var selectElement = <HTMLSelectElement> document.getElementById(comboBoxID);         // Reset the options          selectElement.options.length = 0;          var linkedObjectsToAdd: LinkedObject[] = new Array<LinkedObject>();          var defaultLinkedObject: LinkedObject = new LinkedObject("Not Selected", 0);          linkedObjectsToAdd.push(defaultLinkedObject);          for (var i = 0; i < dataObjects.length; i++) {             var value: string = dataObjects[i].getValue; // Error here             var id: number = dataObjects[i].getId; // And here             var linkedObject: LinkedObject = new LinkedObject(value, id);         }     } } 

Any help will be highly appreciated.

Answer 1

You miss parenthesis:

var value: string = dataObjects[i].getValue();  var id: number = dataObjects[i].getId();