How to initialize an array in angular2 and typescript

Question

Why does this happen in Angular2 and Typescript   export class Environment       constructor        id  string        name  string                environments   new Environment  a   b       app environments environment-form component ts 16 19   error TS2346  Supplied parameters do not match any signature of call target    How on do I initialize an array

User · Answer

you can create and initialize array of any object like this   hero Hero

User · Answer

hi  JackSlayer94 please find the below example to understand how to make an array of size 5     x000D   x000D  class Hero   x000D      name  string  x000D      constructor text  string    x000D          this name   text  x000D        x000D   x000D      display     x000D          return  Hello      this name  x000D        x000D   x000D    x000D   x000D  let heros Hero     new Array 5   x000D  for  let i   0  i  lt  5  i     x000D      heros i    new Hero  Name      i   x000D    x000D   x000D  for  let i   0  i  lt  5  i     x000D      console log heros i  display     x000D    x000D   x000D   x000D

User · Answer

I don t fully understand what you really mean by initializing an array   Here s an example   class Environment           you can declare private  public and protected variables in constructor signature      constructor          private id  string          private name  string                  alert  this id              let environments   new Environment  a   b        creating and initializing array of Environment objects let envArr  Array lt Environment gt               new Environment  c   v             new Environment  c   v             new Environment  g   g             new Environment  3   e           Try it here   https   www typescriptlang org play index html

User · Answer

Class definitions should be like    export class Environment       cId string      cName string       constructor  id  string  name  string              this cId   id          this cName   name             getMyFields            return this cId         this cName            var environments   new Environment  a   b     console log environments getMyFields        will print a b   Source  https   www typescriptlang org docs handbook classes html

User · Answer

You can use this construct   export class AppComponent        title string      myHero string      heroes  any         constructor            this title    Tour of Heros          this heroes   Windstorm   Bombasto   Magneta   Tornado          this myHero   this heroes 0

User · Answer

In order to make more concise you can declare constructor parameters as public which automatically create properties with same names and these properties are available via this   export class Environment      constructor public id number  public name string        getProperties         return    this id      this name           let serverEnv   new Environment 80   port    console log serverEnv     ---result---    Environment   id  80  name   port

[typescript] How to initialize an array in angular2 and typescript

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