App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 295 · 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 your last game level: on the phone or in the cloud? (a) in the cloud (b) on the phone
2. 2.💾 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
3. 3.True or false: a draft you are typing fits saving on the phone. (a) True (b) False
4. 4.True or false: the sound on/off setting fits saving in the cloud. (a) False (b) True
5. 5.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) on the phone (b) in the cloud
6. 6.💾 What number does this code show?
   let notes = ["Maths", "Art", "Music"];
   notes.push("Science");
   notes.push("Hindi");
   show(notes.length);
7. 7.💾 What number does this code show?
   let score = 3;
   score = score - 1;
   score = score + 5;
   show(score);
8. 8.True or false: your last game level fits saving in the cloud. (a) False (b) True
9. 9.Which of these fits saving in the cloud? (a) a class leaderboard (b) the sound on/off setting (c) notes to read offline (d) a draft you are typing
10. 10.True or false: photos on two devices fits saving in the cloud. (a) True (b) False
11. 11.💾 Where should the app save a draft you are typing: on the phone or in the cloud? (a) on the phone (b) in the cloud
12. 12.True or false: a class leaderboard fits saving on the phone. (a) True (b) False
13. 13.True or false: notes to read offline fits saving on the phone. (a) True (b) False
14. 14.💾 Saving data in the cloud lets you ___. (a) skip the internet (b) use it on any device (c) shrink the app (d) never need a password
15. 15.Which of these fits saving in the cloud? (a) notes to read offline (b) a draft you are typing (c) the sound on/off setting (d) chat messages to friends
16. 16.True or false: a draft you are typing fits saving in the cloud. (a) False (b) True
17. 17.True or false: the sound on/off setting fits saving on the phone. (a) False (b) True
18. 18.True or false: a shared to-do list fits saving on the phone. (a) True (b) False
19. 19.💾 What number does this code show?
    let notes = ["Maths", "Hindi", "Music"];
    notes.push("Art");
    show(notes.length);
20. 20.True or false: photos on two devices fits saving on the phone. (a) False (b) True
21. 21.Which of these fits saving on the phone? (a) notes to read offline (b) a class leaderboard (c) photos on two devices (d) chat messages to friends
22. 22.💾 What number does this code show?
    let score = 5;
    score = score - 2;
    score = score + 5;
    show(score);
23. 23.💾 pop() takes off the last item. What does this code show?
    let notes = ["Sports", "Maths", "Science", "Hindi", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Hindi (c) Maths (d) Science
24. 24.💾 What number does this code show?
    let songs = ["Monsoon", "Stars", "Kites"];
    songs.push("Sunrise");
    songs.push("Ocean");
    show(songs.length);
25. 25.💾 What does this code show? (Positions start at 0.)
    let notes = ["Science", "Art", "Hindi", "Sports", "Maths"];
    show(notes[3]); (a) Science (b) Hindi (c) Sports (d) Art
26. 26.💾 Data saved only on the phone is lost when ___. (a) the phone is lost (b) the app is closed (c) the screen turns off (d) you send a message
27. 27.💾 What number does this code show?
    let points = 6;
    points = points - 3;
    points = points + 3;
    show(points);
28. 28.💾 What does this code show? (Positions start at 0.)
    let songs = ["Ocean", "Sunrise", "Stars", "Rain", "Kites"];
    show(songs[1]); (a) Sunrise (b) Rain (c) Stars (d) Ocean
29. 29.💾 What is a variable? (a) a named box for a value (b) a picture (c) a phone setting (d) a type of screen
30. 30.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
31. 31.💾 What number does this code show?
    let friends = ["Kabir", "Zoya", "Aman"];
    friends.push("Arjun");
    show(friends.length);
32. 32.💾 What number does this code show?
    let coins = 9;
    coins = coins - 1;
    coins = coins + 2;
    show(coins);
33. 33.💾 What does this code show? (Positions start at 0.)
    let friends = ["Meera", "Aman", "Arjun", "Kabir"];
    show(friends[3]); (a) Aman (b) Kabir (c) Meera (d) Arjun
34. 34.💾 Where should the app save a shared to-do list: on the phone or in the cloud? (a) on the phone (b) in the cloud
35. 35.💾 What number does this code show?
    let notes = ["Hindi", "Art", "Sports"];
    notes.push("Music");
    show(notes.length);
36. 36.💾 What number does this code show?
    let songs = ["Sunrise", "Kites", "Ocean", "Rain"];
    songs.push("Stars");
    show(songs.length);
37. 37.💾 What number does this code show?
    let points = 7;
    points = points - 1;
    points = points + 5;
    show(points);
38. 38.💾 pop() takes off the last item. What does this code show?
    let notes = ["Science", "Art", "Music", "Sports", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Art (b) Music (c) Sports (d) Science
39. 39.Which of these fits saving on the phone? (a) a shared to-do list (b) chat messages to friends (c) a class leaderboard (d) a draft you are typing
40. 40.Which of these fits saving on the phone? (a) a shared to-do list (b) chat messages to friends (c) your last game level (d) photos on two devices

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