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angular - How to create a counter

app.component.ts 

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})


export class AppComponent {
  counter:number = 0;
  
  getValue(isIncrement:boolean){
    if(isIncrement){
      this.counter++;
    }else{
      this.counter--;
    }
  }
}
app.component.html 

<h2>Angular Counter Example</h2>

<h3>
    Counter : {{counter}}
</h3>

<button 
    (click)="getValue(true)"
    style="padding:12px;">
        Increment
</button>

&nbsp;

<button 
    (click)="getValue(false)"
    style="padding:12px;">
        Decrement
</button>
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