Simple Toggle Item from Array (add or remove) in TS / JS ES6

simple-toggle-item-selection.ts

 const selectedItemIds: number[] = []

  toggleSelect(itemId: number) {
    if (this.selectedItemIds.includes(itemId)) {
      // Remove item from Array if already selected
      const index = this.selectedItemIds.indexOf(itemId)
      this.selectedItemIds.splice(index, 1)
    } else {
      // Adds item to Array
      this.selectedItemIds.push(itemId)
    }

    console.log(this.selectedItemIds)
  }