Filtre

1. const filter = 
2. 
   
3.   (fx, array) => array.reduce(
4. 
   
5.     (acc, item) => fx(item) ? acc.concat(item) : acc, 
6. 
   
7.   []);
8. 
   
9. const greaterThan4 = (x) => x >= 4;
10. 
    
11. const data   = [0, 1, 2, 3, 4, 5];
12. 
    
13. let result = filter(greaterThan4, data);

code