App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 353 · 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.💾 Saving data in the cloud lets you ___. (a) skip the internet (b) shrink the app (c) never need a password (d) use it on any device
2. 2.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
3. 3.💾 What does this code show? (Positions start at 0.)
   let friends = ["Meera", "Aman", "Kabir"];
   show(friends[0]); (a) Aman (b) Kabir (c) Meera
4. 4.True or false: photos on two devices fits saving on the phone. (a) True (b) False
5. 5.Which of these fits saving in the cloud? (a) the sound on/off setting (b) your last game level (c) photos on two devices (d) notes to read offline
6. 6.💾 What number does this code show?
   let stars = 6;
   stars = stars - 3;
   stars = stars + 4;
   show(stars);
7. 7.💾 pop() takes off the last item. What does this code show?
   let notes = ["Hindi", "Art", "Maths"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Art (b) Hindi (c) Maths
8. 8.True or false: the sound on/off setting fits saving in the cloud. (a) True (b) False
9. 9.Which of these fits saving in the cloud? (a) notes to read offline (b) chat messages to friends (c) the sound on/off setting (d) your last game level
10. 10.💾 Data saved only on the phone is lost when ___. (a) the app is closed (b) you send a message (c) the screen turns off (d) the phone is lost
11. 11.💾 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
12. 12.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
13. 13.💾 What number does this code show?
    let score = 7;
    score = score - 6;
    score = score + 1;
    show(score);
14. 14.True or false: a draft you are typing fits saving in the cloud. (a) True (b) False
15. 15.💾 What does this code show? (Positions start at 0.)
    let friends = ["Kabir", "Aman", "Meera"];
    show(friends[1]); (a) Meera (b) Kabir (c) Aman
16. 16.Which of these fits saving on the phone? (a) a class leaderboard (b) chat messages to friends (c) photos on two devices (d) a draft you are typing
17. 17.💾 pop() takes off the last item. What does this code show?
    let friends = ["Arjun", "Meera", "Aman"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Meera (b) Arjun (c) Aman
18. 18.True or false: your last game level fits saving in the cloud. (a) False (b) True
19. 19.True or false: a draft you are typing fits saving on the phone. (a) True (b) False
20. 20.True or false: a shared to-do list fits saving on the phone. (a) False (b) True
21. 21.💾 What number does this code show?
    let lives = 3;
    lives = lives - 3;
    lives = lives + 1;
    show(lives);
22. 22.💾 What number does this code show?
    let stars = 3;
    stars = stars - 2;
    stars = stars + 1;
    show(stars);
23. 23.💾 What number does this code show?
    let notes = ["Hindi", "Music", "Art"];
    notes.push("Science");
    notes.push("Sports");
    show(notes.length);
24. 24.💾 What number does this code show?
    let songs = ["Kites", "Sunrise"];
    songs.push("Ocean");
    songs.push("Rain");
    show(songs.length);
25. 25.💾 pop() takes off the last item. What does this code show?
    let songs = ["Sunrise", "Kites", "Stars", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Sunrise (b) Ocean (c) Stars (d) Kites
26. 26.💾 What number does this code show?
    let score = 9;
    score = score - 8;
    score = score + 3;
    show(score);
27. 27.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
28. 28.💾 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
29. 29.💾 What number does this code show?
    let stars = 8;
    stars = stars - 5;
    stars = stars + 2;
    show(stars);
30. 30.💾 What is a variable? (a) a picture (b) a phone setting (c) a type of screen (d) a named box for a value
31. 31.💾 In most code, the first item of a list is at position ___. (a) 1 (b) 2 (c) 10 (d) 0
32. 32.💾 What does this code show? (Positions start at 0.)
    let friends = ["Aman", "Riya", "Arjun", "Zoya", "Kabir"];
    show(friends[0]); (a) Arjun (b) Aman (c) Zoya (d) Riya
33. 33.💾 What number does this code show?
    let points = 8;
    points = points - 1;
    points = points + 3;
    show(points);
34. 34.💾 What number does this code show?
    let score = 9;
    score = score - 7;
    score = score + 4;
    show(score);
35. 35.💾 What number does this code show?
    let score = 3;
    score = score - 3;
    score = score + 4;
    show(score);
36. 36.Which of these fits saving in the cloud? (a) notes to read offline (b) your last game level (c) the sound on/off setting (d) a class leaderboard
37. 37.True or false: a class leaderboard fits saving on the phone. (a) True (b) False
38. 38.Which of these fits saving on the phone? (a) a class leaderboard (b) the sound on/off setting (c) chat messages to friends (d) photos on two devices
39. 39.💾 What number does this code show?
    let score = 3;
    score = score - 1;
    score = score + 4;
    show(score);
40. 40.💾 What does this code show? (Positions start at 0.)
    let friends = ["Arjun", "Kabir", "Meera", "Zoya"];
    show(friends[3]); (a) Arjun (b) Kabir (c) Zoya (d) Meera

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