App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 160 · 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 notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
2. 2.True or false: chat messages to friends fits saving in the cloud. (a) False (b) True
3. 3.Which of these fits saving on the phone? (a) a shared to-do list (b) photos on two devices (c) a class leaderboard (d) a draft you are typing
4. 4.💾 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
5. 5.💾 Data saved only on the phone is lost when ___. (a) the app is closed (b) you send a message (c) the phone is lost (d) the screen turns off
6. 6.True or false: photos on two devices fits saving on the phone. (a) False (b) True
7. 7.💾 What number does this code show?
   let lives = 4;
   lives = lives - 4;
   lives = lives + 5;
   show(lives);
8. 8.💾 What number does this code show?
   let songs = ["Kites", "Rain", "Monsoon", "Stars"];
   songs.push("Sunrise");
   songs.push("Ocean");
   show(songs.length);
9. 9.💾 pop() takes off the last item. What does this code show?
   let notes = ["Hindi", "Maths", "Sports", "Music"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Music (b) Hindi (c) Maths (d) Sports
10. 10.💾 What number does this code show?
    let songs = ["Kites", "Stars"];
    songs.push("Monsoon");
    show(songs.length);
11. 11.💾 What number does this code show?
    let points = 5;
    points = points - 4;
    points = points + 5;
    show(points);
12. 12.True or false: photos on two devices fits saving in the cloud. (a) True (b) False
13. 13.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
14. 14.💾 What number does this code show?
    let points = 4;
    points = points - 3;
    points = points + 2;
    show(points);
15. 15.💾 What number does this code show?
    let stars = 4;
    stars = stars - 4;
    stars = stars + 1;
    show(stars);
16. 16.💾 What does this code show? (Positions start at 0.)
    let songs = ["Rain", "Kites", "Sunrise", "Monsoon"];
    show(songs[0]); (a) Monsoon (b) Kites (c) Sunrise (d) Rain
17. 17.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Music", "Hindi"];
    show(notes[1]); (a) Maths (b) Hindi (c) Music
18. 18.💾 pop() takes off the last item. What does this code show?
    let songs = ["Kites", "Stars", "Monsoon", "Rain", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Kites (b) Monsoon (c) Stars (d) Rain
19. 19.💾 Where should the app save your last game level: on the phone or in the cloud? (a) in the cloud (b) on the phone
20. 20.💾 What number does this code show?
    let score = 7;
    score = score - 6;
    score = score + 4;
    show(score);
21. 21.💾 What number does this code show?
    let friends = ["Aman", "Arjun"];
    friends.push("Riya");
    show(friends.length);
22. 22.True or false: a class leaderboard fits saving on the phone. (a) True (b) False
23. 23.💾 Which works with no internet at all? (a) a cloud backup (b) data saved on the phone (c) a shared chat (d) a cloud leaderboard
24. 24.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Science", "Sports", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Music (b) Science (c) Maths (d) Sports
25. 25.Which of these fits saving in the cloud? (a) notes to read offline (b) a draft you are typing (c) photos on two devices (d) the sound on/off setting
26. 26.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
27. 27.True or false: a shared to-do list fits saving on the phone. (a) True (b) False
28. 28.Which of these fits saving on the phone? (a) your last game level (b) a class leaderboard (c) chat messages to friends (d) a shared to-do list
29. 29.True or false: the sound on/off setting fits saving in the cloud. (a) True (b) False
30. 30.True or false: notes to read offline fits saving on the phone. (a) True (b) False
31. 31.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Music", "Science", "Hindi", "Sports"];
    show(notes[0]); (a) Science (b) Art (c) Music (d) Hindi
32. 32.💾 pop() takes off the last item. What does this code show?
    let songs = ["Ocean", "Stars", "Monsoon", "Rain", "Kites"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Ocean (b) Monsoon (c) Rain (d) Stars
33. 33.💾 What number does this code show?
    let songs = ["Kites", "Ocean", "Monsoon"];
    songs.push("Sunrise");
    songs.push("Rain");
    show(songs.length);
34. 34.True or false: a draft you are typing fits saving in the cloud. (a) True (b) False
35. 35.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
36. 36.True or false: your last game level fits saving on the phone. (a) True (b) False
37. 37.💾 What number does this code show?
    let friends = ["Arjun", "Riya", "Aman"];
    friends.push("Zoya");
    show(friends.length);
38. 38.💾 pop() takes off the last item. What does this code show?
    let notes = ["Music", "Science", "Art", "Maths", "Sports"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Art (b) Science (c) Music (d) Maths
39. 39.💾 What number does this code show?
    let songs = ["Sunrise", "Ocean", "Monsoon", "Stars"];
    songs.push("Rain");
    show(songs.length);
40. 40.True or false: the sound on/off setting fits saving on the phone. (a) True (b) False

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