1. concat: function
2. every: function
3. filter: function
4. forEach: function
5. indexOf: function
6. join: function
7. lastIndexOf: function
8. map: function
9. pop: function
10. push: function
11. reverse: function
12. shift: function
13. slice: function
14. some: function
15. sort: function
16. splice: function
17. toLocaleString: function
18. toSource: function
19. toString: function
20. unshift: function

1. concat: function
2. every: undefined
3. filter: undefined
4. forEach: undefined
5. indexOf: undefined
6. join: function
7. lastIndexOf: undefined
8. map: undefined
9. pop: function
10. push: function
11. reverse: function
12. shift: function
13. slice: function
14. some: undefined
15. sort: function
16. splice: function
17. toLocaleString: function
18. toSource: undefined
19. toString: function
20. unshift: function