Arrays in type script

Question

I am finding difficulty declaring array in typescript and accessing it   below is the code working for me  class Book       public BookId  number      public Title  string      public Author  string      public Price  number      public Description  string     class dataservice       getproducts             var bk   new Book            bk Author    vamsee           bk BookId   1          var bks  Book      bk bk            return bks length           var ds   new dataservice    var button   document createElement  button     button onclick   function               alert ds getproducts   toString        document body appendChild button     When I change my code as below it fails when trying to assign value to array item   var bks  Book     new Book 2   bks 0  Author    vamsee   bks 0  BookId   1  return bks length    For me to add object in a loop I have to do it the second way

User · Answer

A cleaner way to do this   class Book       public Title  string      public Price  number      public Description  string       constructor public BookId  number  public Author  string        Then  var bks  Book           new Book 1   vamsee

User · Answer

This is a very c  type of code   var bks  Book     new Book 2     In Javascript   Typescript you don t allocate memory up front like that  and that means something completely different  This is how you would do what you want to do   var bks  Book         bks push new Book     bks 0  Author    vamsee   bks 0  BookId   1  return bks length    Now to explain what new Book 2   would mean  This would actually mean that call the new operator on the value of Book 2   e g     Book 2    function    alert  hey     var foo   new Book 2    and you should see hey  Try it

User · Answer

You can also do this as well  shorter cut  instead of having to do instance declaration   You do this in JSON instead   class Book       public BookId  number      public Title  string      public Author  string      public Price  number      public Description  string     var bks  Book           bks push  BookId  1  Title  foo   Author  foo   Price  5  Description   foo         This is all done in JSON

[arrays] Arrays in type script

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