App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 315 · 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.True or false: your last game level fits saving in the cloud. (a) False (b) True
2. 2.💾 What number does this code show?
   let points = 6;
   points = points - 6;
   points = points + 1;
   show(points);
3. 3.Which of these fits saving in the cloud? (a) notes to read offline (b) a shared to-do list (c) the sound on/off setting (d) a draft you are typing
4. 4.💾 What number does this code show?
   let score = 9;
   score = score - 2;
   score = score + 1;
   show(score);
5. 5.💾 What number does this code show?
   let score = 7;
   score = score - 1;
   score = score + 1;
   show(score);
6. 6.💾 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
7. 7.💾 pop() takes off the last item. What does this code show?
   let songs = ["Kites", "Stars", "Ocean"];
   songs.pop();
   show(songs[songs.length - 1]); (a) Stars (b) Kites (c) Ocean
8. 8.Which of these fits saving in the cloud? (a) a draft you are typing (b) the sound on/off setting (c) chat messages to friends (d) notes to read offline
9. 9.💾 Which can hold many values in order? (a) a switch (b) a single number (c) a list (d) a button
10. 10.💾 What number does this code show?
    let friends = ["Aman", "Arjun", "Zoya"];
    friends.push("Riya");
    show(friends.length);
11. 11.💾 What is a variable? (a) a picture (b) a type of screen (c) a named box for a value (d) a phone setting
12. 12.True or false: a class leaderboard fits saving on the phone. (a) True (b) False
13. 13.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Music", "Science", "Maths"];
    show(notes[1]); (a) Science (b) Art (c) Maths (d) Music
14. 14.Which of these fits saving on the phone? (a) a class leaderboard (b) the sound on/off setting (c) a shared to-do list (d) chat messages to friends
15. 15.Which of these fits saving in the cloud? (a) photos on two devices (b) your last game level (c) a draft you are typing (d) notes to read offline
16. 16.True or false: notes to read offline fits saving on the phone. (a) True (b) False
17. 17.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
18. 18.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
19. 19.True or false: a shared to-do list fits saving in the cloud. (a) False (b) True
20. 20.💾 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
21. 21.💾 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
22. 22.💾 What does this code show? (Positions start at 0.)
    let songs = ["Rain", "Stars", "Ocean", "Sunrise", "Kites"];
    show(songs[4]); (a) Ocean (b) Rain (c) Stars (d) Kites
23. 23.💾 pop() takes off the last item. What does this code show?
    let songs = ["Kites", "Stars", "Sunrise"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Kites (b) Sunrise (c) Stars
24. 24.💾 pop() takes off the last item. What does this code show?
    let songs = ["Kites", "Monsoon", "Ocean", "Rain"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Monsoon (b) Kites (c) Rain (d) Ocean
25. 25.💾 pop() takes off the last item. What does this code show?
    let friends = ["Kabir", "Aman", "Riya", "Zoya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Aman (b) Kabir (c) Riya (d) Zoya
26. 26.True or false: the sound on/off setting fits saving in the cloud. (a) True (b) False
27. 27.True or false: a draft you are typing fits saving on the phone. (a) True (b) False
28. 28.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
29. 29.Which of these fits saving on the phone? (a) a class leaderboard (b) notes to read offline (c) photos on two devices (d) a shared to-do list
30. 30.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
31. 31.💾 What does this code show? (Positions start at 0.)
    let notes = ["Music", "Science", "Art", "Maths"];
    show(notes[3]); (a) Art (b) Science (c) Music (d) Maths
32. 32.💾 What number does this code show?
    let notes = ["Sports", "Hindi", "Maths", "Science"];
    notes.push("Music");
    show(notes.length);
33. 33.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Hindi", "Sports"];
    show(notes[0]); (a) Sports (b) Hindi (c) Art
34. 34.💾 What number does this code show?
    let friends = ["Aman", "Meera"];
    friends.push("Riya");
    show(friends.length);
35. 35.💾 What number does this code show?
    let score = 8;
    score = score - 4;
    score = score + 1;
    show(score);
36. 36.💾 Which works with no internet at all? (a) a cloud leaderboard (b) data saved on the phone (c) a shared chat (d) a cloud backup
37. 37.💾 What number does this code show?
    let coins = 4;
    coins = coins - 1;
    coins = coins + 2;
    show(coins);
38. 38.True or false: notes to read offline fits saving in the cloud. (a) False (b) True
39. 39.💾 What does this code show? (Positions start at 0.)
    let notes = ["Sports", "Science", "Art", "Music", "Maths"];
    show(notes[0]); (a) Music (b) Art (c) Sports (d) Science
40. 40.💾 Saving data in the cloud lets you ___. (a) shrink the app (b) skip the internet (c) never need a password (d) use it on any device

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