Typescript How to access component variable in foreach loop?

Hey can somebody tell me how I can access a component variable in foreach loop ? Here my Plunker

 public testVariable:number;

  test(){
    console.log('fired');
    var x  =[1,2,3,4];

    x.forEach(function (e){
      this.testVariable = e;
    })

    console.log( this.testVariable);
  }