App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 602 · 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 chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
2. 2.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
3. 3.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
4. 4.Which of these fits saving on the phone? (a) a shared to-do list (b) chat messages to friends (c) a class leaderboard (d) notes to read offline
5. 5.True or false: chat messages to friends fits saving in the cloud. (a) True (b) False
6. 6.True or false: a class leaderboard fits saving in the cloud. (a) True (b) False
7. 7.💾 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
8. 8.True or false: your last game level fits saving on the phone. (a) False (b) True
9. 9.💾 pop() takes off the last item. What does this code show?
   let songs = ["Kites", "Stars", "Sunrise", "Rain"];
   songs.pop();
   show(songs[songs.length - 1]); (a) Kites (b) Rain (c) Sunrise (d) Stars
10. 10.💾 What number does this code show?
    let score = 9;
    score = score - 1;
    score = score + 1;
    show(score);
11. 11.💾 What number does this code show?
    let songs = ["Monsoon", "Ocean", "Sunrise", "Kites"];
    songs.push("Stars");
    songs.push("Rain");
    show(songs.length);
12. 12.True or false: a draft you are typing fits saving in the cloud. (a) False (b) True
13. 13.Which of these fits saving in the cloud? (a) notes to read offline (b) a draft you are typing (c) a shared to-do list (d) the sound on/off setting
14. 14.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Science", "Maths", "Hindi", "Sports"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Hindi (b) Maths (c) Art (d) Science
15. 15.💾 What number does this code show?
    let coins = 6;
    coins = coins - 5;
    coins = coins + 4;
    show(coins);
16. 16.True or false: your last game level fits saving in the cloud. (a) True (b) False
17. 17.💾 pop() takes off the last item. What does this code show?
    let songs = ["Sunrise", "Kites", "Monsoon"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Monsoon (b) Sunrise (c) Kites
18. 18.Which of these fits saving on the phone? (a) a shared to-do list (b) chat messages to friends (c) the sound on/off setting (d) a class leaderboard
19. 19.💾 Saving data in the cloud lets you ___. (a) skip the internet (b) never need a password (c) use it on any device (d) shrink the app
20. 20.💾 What number does this code show?
    let friends = ["Meera", "Kabir"];
    friends.push("Aman");
    friends.push("Riya");
    show(friends.length);
21. 21.💾 What number does this code show?
    let lives = 5;
    lives = lives - 2;
    lives = lives + 4;
    show(lives);
22. 22.💾 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
23. 23.💾 What number does this code show?
    let friends = ["Meera", "Zoya"];
    friends.push("Riya");
    show(friends.length);
24. 24.True or false: photos on two devices fits saving in the cloud. (a) True (b) False
25. 25.💾 What number does this code show?
    let coins = 7;
    coins = coins - 7;
    coins = coins + 3;
    show(coins);
26. 26.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) in the cloud (b) on the phone
27. 27.💾 What number does this code show?
    let score = 4;
    score = score - 2;
    score = score + 2;
    show(score);
28. 28.💾 What is a variable? (a) a type of screen (b) a phone setting (c) a named box for a value (d) a picture
29. 29.💾 What does this code show? (Positions start at 0.)
    let friends = ["Aman", "Kabir", "Riya", "Arjun"];
    show(friends[2]); (a) Arjun (b) Riya (c) Kabir (d) Aman
30. 30.💾 What number does this code show?
    let lives = 4;
    lives = lives - 1;
    lives = lives + 5;
    show(lives);
31. 31.Which of these fits saving in the cloud? (a) the sound on/off setting (b) photos on two devices (c) a draft you are typing (d) your last game level
32. 32.💾 What does this code show? (Positions start at 0.)
    let songs = ["Kites", "Sunrise", "Stars", "Monsoon", "Rain"];
    show(songs[3]); (a) Stars (b) Sunrise (c) Monsoon (d) Kites
33. 33.💾 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
34. 34.Which of these fits saving in the cloud? (a) the sound on/off setting (b) notes to read offline (c) your last game level (d) chat messages to friends
35. 35.Which of these fits saving on the phone? (a) a shared to-do list (b) a draft you are typing (c) chat messages to friends (d) a class leaderboard
36. 36.💾 What does this code show? (Positions start at 0.)
    let songs = ["Kites", "Stars", "Rain"];
    show(songs[0]); (a) Rain (b) Kites (c) Stars
37. 37.💾 What does this code show? (Positions start at 0.)
    let friends = ["Riya", "Kabir", "Zoya", "Aman"];
    show(friends[0]); (a) Kabir (b) Zoya (c) Riya (d) Aman
38. 38.Which of these fits saving in the cloud? (a) the sound on/off setting (b) notes to read offline (c) your last game level (d) a class leaderboard
39. 39.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Sports", "Hindi", "Music", "Science"];
    show(notes[4]); (a) Art (b) Sports (c) Science (d) Hindi
40. 40.💾 What number does this code show?
    let friends = ["Arjun", "Riya"];
    friends.push("Zoya");
    show(friends.length);

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