import { Component } from '@angular/core'

export interface CollapsibleItem { 
    label: string; 
    text: string;
    state: boolean;
}

@Component({
selector:'whateveryouwant',
template: `


    

       

          minus-icon 
          plus-icon 
         {{ item.label }} 
       
       

          {{ item.text }} 
       
    
`,
styles: ['']  
})

export class YourComponentName {

   constructor() {  }  

    menuItems: CollapsibleItem[] = [
    { label: 'First', text: 'Lorem Ipsum', state: false },
    { label: 'Second', text: 'Lorem Ipsum', state: false },
    { label: 'Third', text: 'Lorem Ipsum', state: false },
   ];

    menuClick(clickedItem: number) {
        this.menuItems[clickedItem].state = !this.menuItems[clickedItem].state  // flips the boolean value for the clicked item 
        for (let item of this.menuItems) {  
           if ( item !== this.menuItems[clickedItem] ) { 
               item.state = false; 
           }
        }
        // the for loop goes through the array and sets each item to false *if* its not the item that was clicked
     }   
 }