App Dev Worksheet: Variables, Lists and Saving

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

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