const does not work!

[cinder finch]

            return w.widgets.filter((wid)=>{
                    if(wid.extension === WidgetExtension.Score){
                         if(this.IsInvalidValidScoreWidget(wid)){
                            wid.isValid = false;
                           const Temp=0;
                            return wid;
                             }
                         else{
                           const Temp=1;
                         }
                    } 
                    
            });
        }).length >0){
            results.set('widget', false);
            results.set('valid', false);
        }

        return results;
       
    }``` Temp is not working although it is const, in my html it does not work!. I think although i make it 0 but it changes to undefined another funney thing is i have this meessage " Temp' is declared but its value is never read". here is my html: 
 <li *ngIf="licensePackage && licensePackage.id===100"  >
            <a routerLink="kpi-view" routerLinkActive="active">  
                <div class="tw-w-3 tw-float-right -tw-mt-3"  *ngIf="Temp===0">
                    <mat-icon svgIcon="alerts_outlined" class="tw-max-w-3" aria-hidden="true"></mat-icon>
                </div>
              summary
            </a>
        </li>

[agile pike]

const/let variables only live in their context. And that's not the component root. You need to assign the value to a new variable created at your component root.

[indigo kestrel]

g!codeblock @cinder finch

[long wedge]

@cinder finch, you can use the following snippet to have your code formatted and colored by Discord. Replace ts with the language you need (i.e. html, js, css, etc)
```ts
// your code goes here
```

[agile pike]

Outside of your third if block, Temp doesn't exist.

[cinder finch]

ok @agile pike , i got you, thanks, so how should i have global var? should i declare public static Temp: number? in the beginnig of this file?

[agile pike]

Not a global one, in your component.

export class MyComponent {
temp: number;
}

[cinder finch]

Thank you @agile pike but my problem is the html file which i need to control an element in it is for a component but i am having and filling out the Temp in one "service".

[agile pike]

Mind without explicit context, it was obvious html and ts were about the same component.

Given the situation I encourage you the official Angular tutorial as it showcases component/service communication.

g!toh @cinder finch

[long wedge]

@cinder finch The place we recommend starting your Angular journey is with the Tour of Heroes tutorial, located here https://angular.io/tutorial.