App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 891 · 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.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
2. 2.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
3. 3.Which of these fits saving on the phone? (a) a shared to-do list (b) chat messages to friends (c) notes to read offline (d) a class leaderboard
4. 4.💾 What number does this code show?
   let songs = ["Stars", "Sunrise"];
   songs.push("Ocean");
   show(songs.length);
5. 5.True or false: your last game level fits saving on the phone. (a) True (b) False
6. 6.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
7. 7.True or false: a class leaderboard fits saving on the phone. (a) True (b) False
8. 8.💾 What number does this code show?
   let notes = ["Maths", "Hindi"];
   notes.push("Science");
   notes.push("Music");
   show(notes.length);
9. 9.True or false: a shared to-do list fits saving on the phone. (a) True (b) False
10. 10.Which of these fits saving on the phone? (a) chat messages to friends (b) a class leaderboard (c) a shared to-do list (d) a draft you are typing
11. 11.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Sports", "Music", "Maths", "Science"];
    show(notes[2]); (a) Maths (b) Music (c) Sports (d) Hindi
12. 12.Which of these fits saving in the cloud? (a) notes to read offline (b) your last game level (c) the sound on/off setting (d) chat messages to friends
13. 13.Which of these fits saving on the phone? (a) your last game level (b) chat messages to friends (c) photos on two devices (d) a class leaderboard
14. 14.💾 Where should the app save the sound on/off setting: on the phone or in the cloud? (a) on the phone (b) in the cloud
15. 15.True or false: chat messages to friends fits saving in the cloud. (a) False (b) True
16. 16.💾 What number does this code show?
    let lives = 3;
    lives = lives - 2;
    lives = lives + 2;
    show(lives);
17. 17.💾 What number does this code show?
    let coins = 3;
    coins = coins - 3;
    coins = coins + 4;
    show(coins);
18. 18.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
19. 19.💾 pop() takes off the last item. What does this code show?
    let notes = ["Music", "Art", "Sports"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Music (b) Sports (c) Art
20. 20.True or false: a draft you are typing fits saving on the phone. (a) False (b) True
21. 21.True or false: a draft you are typing fits saving in the cloud. (a) True (b) False
22. 22.💾 Which works with no internet at all? (a) a cloud backup (b) a shared chat (c) data saved on the phone (d) a cloud leaderboard
23. 23.Which of these fits saving in the cloud? (a) your last game level (b) photos on two devices (c) notes to read offline (d) a draft you are typing
24. 24.💾 What does this code show? (Positions start at 0.)
    let songs = ["Rain", "Sunrise", "Monsoon"];
    show(songs[0]); (a) Rain (b) Sunrise (c) Monsoon
25. 25.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
26. 26.💾 What does this code show? (Positions start at 0.)
    let songs = ["Ocean", "Rain", "Stars", "Sunrise", "Kites"];
    show(songs[2]); (a) Stars (b) Sunrise (c) Rain (d) Ocean
27. 27.💾 Data saved only on the phone is lost when ___. (a) you send a message (b) the phone is lost (c) the app is closed (d) the screen turns off
28. 28.💾 What number does this code show?
    let coins = 6;
    coins = coins - 6;
    coins = coins + 1;
    show(coins);
29. 29.💾 What number does this code show?
    let notes = ["Music", "Art", "Science"];
    notes.push("Sports");
    show(notes.length);
30. 30.💾 What number does this code show?
    let lives = 9;
    lives = lives - 5;
    lives = lives + 1;
    show(lives);
31. 31.💾 pop() takes off the last item. What does this code show?
    let friends = ["Arjun", "Meera", "Riya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Meera (b) Riya (c) Arjun
32. 32.💾 Saving data in the cloud lets you ___. (a) use it on any device (b) never need a password (c) shrink the app (d) skip the internet
33. 33.💾 What number does this code show?
    let songs = ["Monsoon", "Ocean", "Stars", "Rain"];
    songs.push("Kites");
    songs.push("Sunrise");
    show(songs.length);
34. 34.💾 What number does this code show?
    let score = 3;
    score = score - 1;
    score = score + 2;
    show(score);
35. 35.💾 What number does this code show?
    let score = 5;
    score = score - 1;
    score = score + 1;
    show(score);
36. 36.Which of these fits saving on the phone? (a) photos on two devices (b) the sound on/off setting (c) a class leaderboard (d) chat messages to friends
37. 37.True or false: your last game level fits saving in the cloud. (a) False (b) True
38. 38.💾 What number does this code show?
    let friends = ["Aman", "Arjun"];
    friends.push("Riya");
    show(friends.length);
39. 39.💾 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
40. 40.Which of these fits saving in the cloud? (a) a shared to-do list (b) a draft you are typing (c) notes to read offline (d) your last game level

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