App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 769 · 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.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
2. 2.True or false: photos on two devices fits saving in the cloud. (a) False (b) True
3. 3.💾 What number does this code show?
   let songs = ["Ocean", "Sunrise"];
   songs.push("Rain");
   show(songs.length);
4. 4.True or false: a class leaderboard fits saving on the phone. (a) True (b) False
5. 5.Which of these fits saving on the phone? (a) photos on two devices (b) a class leaderboard (c) a draft you are typing (d) a shared to-do list
6. 6.Which of these fits saving on the phone? (a) a class leaderboard (b) your last game level (c) chat messages to friends (d) a shared to-do list
7. 7.💾 What number does this code show?
   let stars = 8;
   stars = stars - 1;
   stars = stars + 5;
   show(stars);
8. 8.💾 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
9. 9.💾 Data saved only on the phone is lost when ___. (a) the screen turns off (b) the phone is lost (c) the app is closed (d) you send a message
10. 10.💾 What is a variable? (a) a type of screen (b) a picture (c) a phone setting (d) a named box for a value
11. 11.💾 What number does this code show?
    let score = 5;
    score = score - 1;
    score = score + 1;
    show(score);
12. 12.💾 What does this code show? (Positions start at 0.)
    let friends = ["Kabir", "Aman", "Zoya", "Arjun", "Riya"];
    show(friends[0]); (a) Zoya (b) Arjun (c) Aman (d) Kabir
13. 13.True or false: chat messages to friends fits saving in the cloud. (a) True (b) False
14. 14.💾 What number does this code show?
    let songs = ["Monsoon", "Sunrise", "Rain"];
    songs.push("Kites");
    show(songs.length);
15. 15.💾 In most code, the first item of a list is at position ___. (a) 2 (b) 1 (c) 10 (d) 0
16. 16.💾 pop() takes off the last item. What does this code show?
    let friends = ["Zoya", "Riya", "Arjun"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Riya (b) Arjun (c) Zoya
17. 17.💾 What does this code show? (Positions start at 0.)
    let songs = ["Sunrise", "Ocean", "Rain", "Stars", "Kites"];
    show(songs[3]); (a) Stars (b) Rain (c) Ocean (d) Sunrise
18. 18.Which of these fits saving in the cloud? (a) notes to read offline (b) the sound on/off setting (c) a draft you are typing (d) a class leaderboard
19. 19.💾 What does this code show? (Positions start at 0.)
    let friends = ["Meera", "Zoya", "Arjun"];
    show(friends[0]); (a) Meera (b) Arjun (c) Zoya
20. 20.💾 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
21. 21.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
22. 22.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
23. 23.True or false: a draft you are typing fits saving in the cloud. (a) True (b) False
24. 24.💾 What number does this code show?
    let points = 4;
    points = points - 2;
    points = points + 3;
    show(points);
25. 25.💾 What number does this code show?
    let coins = 9;
    coins = coins - 6;
    coins = coins + 3;
    show(coins);
26. 26.💾 pop() takes off the last item. What does this code show?
    let songs = ["Sunrise", "Monsoon", "Kites"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Sunrise (b) Monsoon (c) Kites
27. 27.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
28. 28.💾 What number does this code show?
    let score = 9;
    score = score - 8;
    score = score + 1;
    show(score);
29. 29.💾 What number does this code show?
    let notes = ["Science", "Hindi", "Maths"];
    notes.push("Sports");
    show(notes.length);
30. 30.True or false: a shared to-do list fits saving in the cloud. (a) False (b) True
31. 31.💾 pop() takes off the last item. What does this code show?
    let friends = ["Aman", "Kabir", "Riya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Aman (b) Riya (c) Kabir
32. 32.💾 pop() takes off the last item. What does this code show?
    let friends = ["Riya", "Aman", "Arjun", "Kabir"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Riya (b) Kabir (c) Aman (d) Arjun
33. 33.💾 What number does this code show?
    let songs = ["Stars", "Kites"];
    songs.push("Monsoon");
    songs.push("Rain");
    show(songs.length);
34. 34.💾 Saving data in the cloud lets you ___. (a) skip the internet (b) shrink the app (c) use it on any device (d) never need a password
35. 35.💾 What does this code show? (Positions start at 0.)
    let songs = ["Kites", "Sunrise", "Monsoon", "Stars"];
    show(songs[3]); (a) Kites (b) Sunrise (c) Monsoon (d) Stars
36. 36.True or false: the sound on/off setting fits saving in the cloud. (a) False (b) True
37. 37.💾 What number does this code show?
    let lives = 8;
    lives = lives - 4;
    lives = lives + 3;
    show(lives);
38. 38.💾 Which works with no internet at all? (a) a cloud backup (b) data saved on the phone (c) a cloud leaderboard (d) a shared chat
39. 39.💾 pop() takes off the last item. What does this code show?
    let notes = ["Sports", "Science", "Maths", "Music", "Hindi"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Maths (c) Science (d) Music
40. 40.💾 What number does this code show?
    let score = 3;
    score = score - 1;
    score = score + 2;
    show(score);

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