How to instantiate initialize and populate an array in TypeScript

Question

I have the following classes in TypeScript   class bar       length  number     class foo       bars  bar     new Array        And then I have   var ham   new foo    ham bars         new bar                  lt -- compiler says Expected     and Expected             length   1            Is there a way to do that in TypeScript   UPDATE  I came up with another solution by having a set method to return itself   class bar       length  number       private ht  number      height h  number   bar           this ht   h  return this             constructor len  number            this length   len           class foo       bars  bar     new Array        setBars items  bar              this bars   items          return this            so you can initialize it as below   var ham   new foo    ham setBars                new bar 1  height 2           new bar 3

User · Answer

A simple solution could be   interface bar       length  number     let bars  bar    bars

User · Answer

If you really want to have named parameters plus have your objects be instances of your class  you can do the following   class bar       constructor  options    length  number  height  number              if  options                this length   options length              this height   options height                      length  number      height  number     class foo       bars  bar     new Array       var ham   new foo    ham bars         new bar  length  4  height  2        new bar  length  1  height  3        Also here s the related item on typescript issue tracker

User · Answer

There isn t a field initialization syntax like that for objects in JavaScript or TypeScript   Option 1   class bar          Makes a public field called  length      constructor public length  number         bars     new bar 1       Option 2   interface bar       length  number     bars      length  1

User · Answer

An other solution   interface bar       length  number     bars        length  1   as bar

User · Answer

If you would like to  add  additional items to a page  you may want to create an array of maps  This is how I created an array of maps and then added results to it   import   Product   from     models product    products  Array lt Product gt               Initialize the array          let i   0  this service products  i    result    gt         if   i    0                Create the first element of the array          this products   Array result         else               Add to the array of maps          this products push result                Where product ts look like     export class Product       id  number

[javascript] How to instantiate, initialize and populate an array in TypeScript?

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