1return Array.from(new Set(this.posts.map(e => e.category)))

1let nombres = [10, 45, 75, 10 ,24,45 ] ;
2//let monSet = new Set(nombres) ;
3let monSet = new Set() ;
4
5monSet.add('100') ;
6monSet.add('280') ; 
7//monSet.delete('100');
8
9console.log(monSet.size) ;
10
11