App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 958 · 40 questions

Developer's tip (Box, list, place): A variable holds one value; a list holds many in order. Positions start at 0. push adds to the end; pop takes off the last item; length is how many items. On the phone: works offline, private. In the cloud: shared, any device, needs the internet.

1. 1.Which of these fits saving in the cloud? (a) the sound on/off setting (b) a draft you are typing (c) chat messages to friends (d) notes to read offline
2. 2.💾 What number does this code show?
   let score = 8;
   score = score - 3;
   score = score + 4;
   show(score);
3. 3.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
4. 4.💾 Where should the app save the sound on/off setting: on the phone or in the cloud? (a) in the cloud (b) on the phone
5. 5.💾 What does this code show? (Positions start at 0.)
   let friends = ["Riya", "Aman", "Zoya", "Meera", "Kabir"];
   show(friends[3]); (a) Aman (b) Zoya (c) Meera (d) Riya
6. 6.Which of these fits saving on the phone? (a) chat messages to friends (b) a class leaderboard (c) notes to read offline (d) a shared to-do list
7. 7.True or false: photos on two devices fits saving on the phone. (a) True (b) False
8. 8.💾 What is a variable? (a) a phone setting (b) a type of screen (c) a picture (d) a named box for a value
9. 9.💾 What number does this code show?
   let lives = 4;
   lives = lives - 1;
   lives = lives + 3;
   show(lives);
10. 10.💾 Data saved only on the phone is lost when ___. (a) you send a message (b) the app is closed (c) the phone is lost (d) the screen turns off
11. 11.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
12. 12.💾 In most code, the first item of a list is at position ___. (a) 0 (b) 1 (c) 2 (d) 10
13. 13.Which of these fits saving in the cloud? (a) your last game level (b) a draft you are typing (c) a class leaderboard (d) notes to read offline
14. 14.💾 Which works with no internet at all? (a) a cloud leaderboard (b) a cloud backup (c) data saved on the phone (d) a shared chat
15. 15.💾 Where should the app save a shared to-do list: on the phone or in the cloud? (a) in the cloud (b) on the phone
16. 16.💾 What number does this code show?
    let friends = ["Kabir", "Riya", "Zoya", "Arjun"];
    friends.push("Aman");
    friends.push("Meera");
    show(friends.length);
17. 17.💾 pop() takes off the last item. What does this code show?
    let friends = ["Meera", "Riya", "Aman"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Aman (b) Riya (c) Meera
18. 18.True or false: a draft you are typing fits saving on the phone. (a) False (b) True
19. 19.💾 What does this code show? (Positions start at 0.)
    let songs = ["Kites", "Rain", "Monsoon"];
    show(songs[1]); (a) Monsoon (b) Rain (c) Kites
20. 20.💾 What does this code show? (Positions start at 0.)
    let songs = ["Ocean", "Kites", "Rain", "Stars", "Monsoon"];
    show(songs[0]); (a) Rain (b) Ocean (c) Kites (d) Stars
21. 21.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
22. 22.💾 What number does this code show?
    let lives = 6;
    lives = lives - 1;
    lives = lives + 1;
    show(lives);
23. 23.Which of these fits saving on the phone? (a) a class leaderboard (b) the sound on/off setting (c) chat messages to friends (d) photos on two devices
24. 24.True or false: the sound on/off setting fits saving on the phone. (a) False (b) True
25. 25.💾 pop() takes off the last item. What does this code show?
    let songs = ["Stars", "Rain", "Ocean", "Sunrise"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Stars (b) Ocean (c) Rain (d) Sunrise
26. 26.💾 What does this code show? (Positions start at 0.)
    let friends = ["Riya", "Meera", "Arjun"];
    show(friends[1]); (a) Meera (b) Arjun (c) Riya
27. 27.True or false: notes to read offline fits saving in the cloud. (a) False (b) True
28. 28.💾 What number does this code show?
    let notes = ["Maths", "Music", "Sports"];
    notes.push("Art");
    show(notes.length);
29. 29.💾 What number does this code show?
    let score = 5;
    score = score - 1;
    score = score + 2;
    show(score);
30. 30.True or false: notes to read offline fits saving on the phone. (a) True (b) False
31. 31.True or false: a class leaderboard fits saving in the cloud. (a) True (b) False
32. 32.True or false: a class leaderboard fits saving on the phone. (a) False (b) True
33. 33.True or false: the sound on/off setting fits saving in the cloud. (a) True (b) False
34. 34.True or false: a shared to-do list fits saving on the phone. (a) False (b) True
35. 35.True or false: a draft you are typing fits saving in the cloud. (a) True (b) False
36. 36.💾 pop() takes off the last item. What does this code show?
    let notes = ["Sports", "Maths", "Hindi"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Maths (b) Hindi (c) Sports
37. 37.Which of these fits saving on the phone? (a) your last game level (b) a shared to-do list (c) photos on two devices (d) chat messages to friends
38. 38.💾 Where should the app save a draft you are typing: on the phone or in the cloud? (a) in the cloud (b) on the phone
39. 39.Which of these fits saving on the phone? (a) chat messages to friends (b) photos on two devices (c) a draft you are typing (d) a class leaderboard
40. 40.💾 What number does this code show?
    let points = 8;
    points = points - 5;
    points = points + 4;
    show(points);

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