App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 407 · 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 on the phone. (a) False (b) True
2. 2.💾 Which can hold many values in order? (a) a single number (b) a list (c) a switch (d) a button
3. 3.💾 pop() takes off the last item. What does this code show?
   let notes = ["Music", "Sports", "Maths", "Hindi"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Hindi (b) Sports (c) Maths (d) Music
4. 4.True or false: the sound on/off setting fits saving in the cloud. (a) False (b) True
5. 5.💾 What does this code show? (Positions start at 0.)
   let songs = ["Rain", "Kites", "Ocean", "Stars", "Sunrise"];
   show(songs[0]); (a) Stars (b) Kites (c) Rain (d) Ocean
6. 6.💾 pop() takes off the last item. What does this code show?
   let notes = ["Maths", "Hindi", "Art"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Hindi (b) Maths (c) Art
7. 7.💾 What number does this code show?
   let songs = ["Kites", "Ocean", "Sunrise"];
   songs.push("Monsoon");
   songs.push("Rain");
   show(songs.length);
8. 8.Which of these fits saving in the cloud? (a) chat messages to friends (b) the sound on/off setting (c) your last game level (d) a draft you are typing
9. 9.Which of these fits saving on the phone? (a) photos on two devices (b) a shared to-do list (c) chat messages to friends (d) your last game level
10. 10.Which of these fits saving in the cloud? (a) a draft you are typing (b) a class leaderboard (c) notes to read offline (d) the sound on/off setting
11. 11.💾 pop() takes off the last item. What does this code show?
    let friends = ["Arjun", "Zoya", "Meera", "Aman", "Kabir"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Meera (b) Arjun (c) Aman (d) Zoya
12. 12.💾 What number does this code show?
    let friends = ["Arjun", "Riya", "Zoya"];
    friends.push("Kabir");
    show(friends.length);
13. 13.💾 What number does this code show?
    let songs = ["Monsoon", "Ocean", "Kites"];
    songs.push("Sunrise");
    show(songs.length);
14. 14.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) on the phone (b) in the cloud
15. 15.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
16. 16.💾 pop() takes off the last item. What does this code show?
    let friends = ["Kabir", "Zoya", "Riya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Zoya (b) Riya (c) Kabir
17. 17.💾 What number does this code show?
    let points = 7;
    points = points - 1;
    points = points + 5;
    show(points);
18. 18.Which of these fits saving on the phone? (a) a class leaderboard (b) chat messages to friends (c) photos on two devices (d) notes to read offline
19. 19.💾 Saving data in the cloud lets you ___. (a) use it on any device (b) skip the internet (c) shrink the app (d) never need a password
20. 20.💾 What does this code show? (Positions start at 0.)
    let songs = ["Kites", "Sunrise", "Rain"];
    show(songs[1]); (a) Sunrise (b) Kites (c) Rain
21. 21.💾 What number does this code show?
    let points = 6;
    points = points - 6;
    points = points + 5;
    show(points);
22. 22.💾 Which works with no internet at all? (a) data saved on the phone (b) a shared chat (c) a cloud leaderboard (d) a cloud backup
23. 23.True or false: notes to read offline fits saving on the phone. (a) False (b) True
24. 24.💾 What does this code show? (Positions start at 0.)
    let friends = ["Zoya", "Meera", "Aman"];
    show(friends[0]); (a) Meera (b) Aman (c) Zoya
25. 25.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
26. 26.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Science", "Sports", "Art", "Music"];
    show(notes[2]); (a) Art (b) Maths (c) Science (d) Sports
27. 27.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Science", "Sports"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Art (c) Science
28. 28.💾 What does this code show? (Positions start at 0.)
    let friends = ["Meera", "Riya", "Kabir", "Aman"];
    show(friends[3]); (a) Riya (b) Meera (c) Kabir (d) Aman
29. 29.💾 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
30. 30.💾 What number does this code show?
    let notes = ["Science", "Hindi", "Maths"];
    notes.push("Music");
    show(notes.length);
31. 31.💾 Where should the app save a draft you are typing: on the phone or in the cloud? (a) on the phone (b) in the cloud
32. 32.True or false: notes to read offline fits saving in the cloud. (a) False (b) True
33. 33.💾 What does this code show? (Positions start at 0.)
    let friends = ["Arjun", "Zoya", "Aman"];
    show(friends[1]); (a) Zoya (b) Aman (c) Arjun
34. 34.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) on the phone (b) in the cloud
35. 35.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Hindi", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Art (b) Hindi (c) Music
36. 36.💾 What number does this code show?
    let friends = ["Aman", "Meera", "Zoya", "Kabir"];
    friends.push("Riya");
    friends.push("Arjun");
    show(friends.length);
37. 37.💾 Where should the app save a shared to-do list: on the phone or in the cloud? (a) in the cloud (b) on the phone
38. 38.💾 What number does this code show?
    let coins = 3;
    coins = coins - 2;
    coins = coins + 2;
    show(coins);
39. 39.Which of these fits saving in the cloud? (a) notes to read offline (b) the sound on/off setting (c) your last game level (d) a shared to-do list
40. 40.Which of these fits saving on the phone? (a) chat messages to friends (b) a draft you are typing (c) photos on two devices (d) a shared to-do list

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