Typescript: Unable to get value of the property 'block': object is null or undefined

Question

I write code for valid phone number. But when I compile project I have following mistakes:

1. Unable to get value of the property 'block': object is null or undefined;

2. output from command ""C:\Program Files (x86)\Microsoft SDKs\TypeScript\tsc" "C:..\Scripts\MyScripts\TS\BuildPhone.ts" "C:..\Scripts\MyScripts\TS\ProductsViewModel.ts" "C:..\Scripts\MyScripts\TS\helloWorld.ts"" with code 1.

   // Interface
   interface IPhoneBuild
   {
       showPhone(): string;
       checkPhone(): boolean;
   }
   
   class Phone
   {
       Code: string;
       Number: string;
       Fax: boolean;
   }
   
   // Module
   module Phones
   {
       // Class
       export class PhoneBuild implements IPhoneBuild
       {
           private phone: Phone;
           private codes: string[];
   
           // Constructor
           constructor(public Number: string, public Code: string, public Codes: string[])
           {
               this.phone = this.buildPhone(Number, Code);
               this.codes = Codes;
           }
   
           //Private Methods
           private clearPhone(public reg: string)
           {
               var re = /\W/g;
               return reg.replace(re, "");
           }
   
           private buildPhone(public num: string, public code: string)
           {
               var p: Phone = { Code: "", Number: "", Fax: false };
   
               num = this.clearPhone(num);
   
               if (num.length == 6)
               {
                   p = { Code: code, Fax: false, Number: num };
               }
   
               if (num.length == 11)
               {
                   p = { Code: num.substring(0, 4), Fax: false, Number: num.substring(4)};
               }
   
               return p;
           }
   
           // Instance member
           public showPhone()
           {
               return this.phone.Code + this.phone.Number;
           }
   
           public checkPhone()
           {
               return this.phone.Number.length != 7 || this.phone.Code.length == 0;
           }
       }
   }
   

What do you think about? I need help.

I found resolve: Delete "public" in properties in methods: buildPhone and clearPhone.

Answer 1

You cannot declare parameters of a member function as public. That is only valid for constructors where it is used as a shorthand for:

• declaring a member variable
• also assigning the input parameter to the member variable