App Dev Worksheet: Functions

App development lesson 20: Functions · Set 546 · 40 questions

Developer's tip (Write once, use often): function name(parameter) { …; return result; } — call it with name(value). Work out each call separately, then finish the line. Inside a function, if / return can give different results for different inputs.

1. 1.🧰 What number does this code show?
   function points(stars) {
     return stars * 10 + 5;
   }
   show(points(3) + points(0));
2. 2.🧰 What number does this code show?
   function points(stars) {
     return stars * 10 + 5;
   }
   show(points(2) + points(2));
3. 3.🧰 What does this code show?
   function greet(name) {
     return "Hi, " + name + "!";
   }
   show(greet("Aman")); (a) Hi, Aman! (b) greet (c) Aman (d) Hi, name!
4. 4.🧰 What number does this code show?
   function total(price, qty) {
     return price * qty;
   }
   show(total(90, 4));
5. 5.🧰 What number does this code show?
   function double(n) {
     return n * 2;
   }
   show(double(6));
6. 6.🧰 What number does this code show?
   function points(stars) {
     return stars * 10 + 5;
   }
   show(points(3) + points(1));
7. 7.🧰 Why write a function? (a) to slow the app (b) to make code longer (c) to reuse code (d) to hide errors
8. 8.🧰 What number does this code show?
   function points(stars) {
     return stars * 10 + 5;
   }
   show(points(1) + points(3));
9. 9.🧰 What number does this code show?
   function triple(n) {
     return n * 3;
   }
   show(triple(6));
10. 10.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(4) + points(2));
11. 11.🧰 What is a function? (a) a named block of code (b) a screen size (c) a type of phone (d) a list of colours
12. 12.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(45, 2));
13. 13.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(2) + points(5));
14. 14.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(15));
15. 15.🧰 What number does this code show?
    function triple(n) {
      return n * 3;
    }
    show(triple(10));
16. 16.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(95, 4));
17. 17.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(25, 3));
18. 18.🧰 What does this code show?
    function greet(name) {
      return "Hi, " + name + "!";
    }
    show(greet("Zoya")); (a) greet (b) Hi, Zoya! (c) Zoya (d) Hi, name!
19. 19.🧰 What does this code show?
    function greet(name) {
      return "Well done, " + name + "!";
    }
    show(greet("Kabir")); (a) greet (b) Well done, Kabir! (c) Well done, name! (d) Kabir
20. 20.🧰 What number does this code show?
    function triple(n) {
      return n * 3;
    }
    show(triple(33));
21. 21.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(3));
22. 22.🧰 What does this code show?
    function greet(name) {
      return "Well done, " + name + "!";
    }
    show(greet("Zoya")); (a) greet (b) Well done, Zoya! (c) Well done, name! (d) Zoya
23. 23.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(75, 6));
24. 24.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(24));
25. 25.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(40, 3));
26. 26.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(1) + points(5));
27. 27.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(14));
28. 28.🧰 What does this code show?
    function greet(name) {
      return "Hello, " + name + "!";
    }
    show(greet("Kabir")); (a) Hello, name! (b) greet (c) Hello, Kabir! (d) Kabir
29. 29.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(12));
30. 30.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(100, 3));
31. 31.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(2) + points(3));
32. 32.🧰 What does return do in a function? (a) sends back a value (b) deletes the app (c) closes the screen (d) repeats the code
33. 33.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(5) + points(0));
34. 34.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(2) + points(1));
35. 35.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(9));
36. 36.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(19));
37. 37.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(65, 6));
38. 38.🧰 What does this code show?
    function greet(name) {
      return "Hi, " + name + "!";
    }
    show(greet("Meera")); (a) Hi, name! (b) greet (c) Meera (d) Hi, Meera!
39. 39.🧰 What does this code show?
    function greet(name) {
      return "Hello, " + name + "!";
    }
    show(greet("Meera")); (a) Hello, name! (b) greet (c) Meera (d) Hello, Meera!
40. 40.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(25, 2));

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