pagination-2.component.ts

export class PaginationComponent {
   // ...

    getNavigablePages(): number[] {
        const pages = []
        const left = Math.max(1, this.currentPage - this.windowSize)
        const right = Math.min(this.totalPages, this.currentPage + this.windowSize)
        for (let i = left; i <= right; i++) {
            pages.push(i)
        }
        return pages
    }
}