Updating an array within foreach method Angular

Question

Hi folks running into an error I think is related to scope that I was hoping I could get some advice on. I have an array that I am looping through that I want to push the results to. When I try and push the results to public myArray:Array from within this.test.forEach I get the following error does not exist on type void. Any advice greatly appreciated.

 export class componentName implements OnInit {
 public myArray:Array<any>;

 ngOnInit() {
  this.test = diff(this.example1, this.example2);

  this.test.forEach(function(part){
    let span = document.createElement('span');
    span.appendChild(document.createTextNode(part.value));

    this.myArray.push(span); // error does not exist on type void
  });
}

Possible duplicate of How to access the correct `this` context inside a callback? — eko
– eko, Commented May 30, 2017 at 8:34

eko · Accepted Answer · 2017-05-30 08:35:38Z

3

Your first error is that you are using the wrong scope for this.

this.test.forEach(function(part){

Should be

 this.test.forEach((part)=>{

and you need to initialize your array.

public myArray:Array<any> = [];

answered May 30, 2017 at 8:35

eko

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