App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 489 · 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 a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
2. 2.True or false: the sound on/off setting fits saving in the cloud. (a) False (b) True
3. 3.True or false: chat messages to friends fits saving in the cloud. (a) False (b) True
4. 4.Which of these fits saving in the cloud? (a) a draft you are typing (b) notes to read offline (c) chat messages to friends (d) your last game level
5. 5.💾 pop() takes off the last item. What does this code show?
   let songs = ["Stars", "Rain", "Monsoon", "Kites"];
   songs.pop();
   show(songs[songs.length - 1]); (a) Stars (b) Monsoon (c) Rain (d) Kites
6. 6.Which of these fits saving on the phone? (a) photos on two devices (b) chat messages to friends (c) a draft you are typing (d) a class leaderboard
7. 7.💾 What number does this code show?
   let points = 8;
   points = points - 5;
   points = points + 1;
   show(points);
8. 8.Which of these fits saving in the cloud? (a) notes to read offline (b) a shared to-do list (c) your last game level (d) the sound on/off setting
9. 9.💾 What number does this code show?
   let songs = ["Sunrise", "Rain"];
   songs.push("Monsoon");
   songs.push("Stars");
   show(songs.length);
10. 10.💾 Where should the app save your last game level: on the phone or in the cloud? (a) in the cloud (b) on the phone
11. 11.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Maths", "Sports", "Music", "Art"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Maths (b) Hindi (c) Music (d) Sports
12. 12.Which of these fits saving in the cloud? (a) the sound on/off setting (b) notes to read offline (c) a draft you are typing (d) a class leaderboard
13. 13.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
14. 14.Which of these fits saving on the phone? (a) a class leaderboard (b) a shared to-do list (c) chat messages to friends (d) notes to read offline
15. 15.💾 Which can hold many values in order? (a) a list (b) a button (c) a single number (d) a switch
16. 16.True or false: a class leaderboard fits saving on the phone. (a) True (b) False
17. 17.💾 What is a variable? (a) a picture (b) a named box for a value (c) a phone setting (d) a type of screen
18. 18.True or false: a shared to-do list fits saving on the phone. (a) True (b) False
19. 19.True or false: photos on two devices fits saving on the phone. (a) True (b) False
20. 20.💾 What number does this code show?
    let coins = 6;
    coins = coins - 3;
    coins = coins + 5;
    show(coins);
21. 21.💾 What number does this code show?
    let coins = 3;
    coins = coins - 2;
    coins = coins + 4;
    show(coins);
22. 22.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Art", "Hindi"];
    show(notes[0]); (a) Art (b) Hindi (c) Maths
23. 23.💾 pop() takes off the last item. What does this code show?
    let songs = ["Stars", "Kites", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Kites (b) Ocean (c) Stars
24. 24.💾 Which works with no internet at all? (a) data saved on the phone (b) a cloud leaderboard (c) a cloud backup (d) a shared chat
25. 25.Which of these fits saving on the phone? (a) a shared to-do list (b) a class leaderboard (c) photos on two devices (d) the sound on/off setting
26. 26.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
27. 27.💾 pop() takes off the last item. What does this code show?
    let friends = ["Meera", "Aman", "Arjun", "Riya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Meera (b) Aman (c) Riya (d) Arjun
28. 28.💾 pop() takes off the last item. What does this code show?
    let songs = ["Rain", "Ocean", "Sunrise", "Kites", "Monsoon"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Rain (b) Kites (c) Sunrise (d) Ocean
29. 29.💾 What number does this code show?
    let songs = ["Rain", "Stars", "Kites", "Ocean"];
    songs.push("Monsoon");
    show(songs.length);
30. 30.True or false: a draft you are typing fits saving in the cloud. (a) True (b) False
31. 31.Which of these fits saving on the phone? (a) photos on two devices (b) chat messages to friends (c) your last game level (d) a shared to-do list
32. 32.True or false: chat messages to friends fits saving on the phone. (a) True (b) False
33. 33.💾 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
34. 34.💾 What does this code show? (Positions start at 0.)
    let notes = ["Music", "Maths", "Art"];
    show(notes[1]); (a) Art (b) Maths (c) Music
35. 35.💾 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
36. 36.💾 What number does this code show?
    let score = 3;
    score = score - 3;
    score = score + 2;
    show(score);
37. 37.💾 What number does this code show?
    let songs = ["Monsoon", "Ocean", "Rain", "Sunrise"];
    songs.push("Kites");
    show(songs.length);
38. 38.💾 What number does this code show?
    let score = 5;
    score = score - 2;
    score = score + 3;
    show(score);
39. 39.💾 What number does this code show?
    let songs = ["Rain", "Ocean"];
    songs.push("Monsoon");
    show(songs.length);
40. 40.💾 What number does this code show?
    let songs = ["Sunrise", "Stars"];
    songs.push("Kites");
    songs.push("Ocean");
    show(songs.length);

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