App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 932 · 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 your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
2. 2.💾 What number does this code show?
   let notes = ["Music", "Maths"];
   notes.push("Sports");
   notes.push("Hindi");
   show(notes.length);
3. 3.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
4. 4.Which of these fits saving in the cloud? (a) your last game level (b) a draft you are typing (c) chat messages to friends (d) notes to read offline
5. 5.💾 In most code, the first item of a list is at position ___. (a) 0 (b) 2 (c) 10 (d) 1
6. 6.💾 What number does this code show?
   let songs = ["Rain", "Kites"];
   songs.push("Ocean");
   songs.push("Stars");
   show(songs.length);
7. 7.💾 What number does this code show?
   let songs = ["Monsoon", "Ocean"];
   songs.push("Rain");
   show(songs.length);
8. 8.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
9. 9.💾 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
10. 10.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Science", "Hindi"];
    show(notes[0]); (a) Science (b) Hindi (c) Maths
11. 11.💾 What number does this code show?
    let stars = 4;
    stars = stars - 1;
    stars = stars + 1;
    show(stars);
12. 12.💾 What does this code show? (Positions start at 0.)
    let songs = ["Rain", "Ocean", "Kites"];
    show(songs[0]); (a) Rain (b) Kites (c) Ocean
13. 13.💾 pop() takes off the last item. What does this code show?
    let notes = ["Sports", "Music", "Art"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Art (c) Music
14. 14.💾 What does this code show? (Positions start at 0.)
    let songs = ["Monsoon", "Sunrise", "Stars", "Ocean", "Kites"];
    show(songs[3]); (a) Sunrise (b) Stars (c) Monsoon (d) Ocean
15. 15.True or false: a draft you are typing fits saving on the phone. (a) False (b) True
16. 16.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Art", "Science", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Music (b) Art (c) Maths (d) Science
17. 17.True or false: photos on two devices fits saving in the cloud. (a) False (b) True
18. 18.💾 What number does this code show?
    let friends = ["Kabir", "Riya"];
    friends.push("Arjun");
    friends.push("Aman");
    show(friends.length);
19. 19.💾 What does this code show? (Positions start at 0.)
    let friends = ["Meera", "Aman", "Zoya"];
    show(friends[0]); (a) Zoya (b) Meera (c) Aman
20. 20.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Science", "Maths", "Sports"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Science (b) Sports (c) Art (d) Maths
21. 21.💾 What number does this code show?
    let friends = ["Kabir", "Arjun", "Zoya", "Riya"];
    friends.push("Aman");
    show(friends.length);
22. 22.💾 What does this code show? (Positions start at 0.)
    let friends = ["Zoya", "Riya", "Aman", "Kabir"];
    show(friends[3]); (a) Kabir (b) Riya (c) Zoya (d) Aman
23. 23.Which of these fits saving in the cloud? (a) a draft you are typing (b) the sound on/off setting (c) your last game level (d) a shared to-do list
24. 24.💾 What number does this code show?
    let notes = ["Music", "Maths", "Science", "Art"];
    notes.push("Hindi");
    show(notes.length);
25. 25.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
26. 26.True or false: a class leaderboard fits saving in the cloud. (a) True (b) False
27. 27.💾 What number does this code show?
    let songs = ["Monsoon", "Stars"];
    songs.push("Kites");
    show(songs.length);
28. 28.💾 Which works with no internet at all? (a) a cloud leaderboard (b) a shared chat (c) a cloud backup (d) data saved on the phone
29. 29.💾 What does this code show? (Positions start at 0.)
    let notes = ["Music", "Hindi", "Maths"];
    show(notes[1]); (a) Maths (b) Music (c) Hindi
30. 30.💾 What does this code show? (Positions start at 0.)
    let friends = ["Kabir", "Zoya", "Aman", "Meera", "Riya"];
    show(friends[3]); (a) Kabir (b) Zoya (c) Meera (d) Aman
31. 31.💾 What number does this code show?
    let notes = ["Art", "Sports"];
    notes.push("Maths");
    show(notes.length);
32. 32.💾 Saving data in the cloud lets you ___. (a) shrink the app (b) use it on any device (c) skip the internet (d) never need a password
33. 33.💾 What number does this code show?
    let songs = ["Kites", "Rain"];
    songs.push("Sunrise");
    show(songs.length);
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.Which of these fits saving on the phone? (a) a shared to-do list (b) chat messages to friends (c) a class leaderboard (d) a draft you are typing
36. 36.💾 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
37. 37.💾 What number does this code show?
    let stars = 9;
    stars = stars - 1;
    stars = stars + 5;
    show(stars);
38. 38.💾 What number does this code show?
    let friends = ["Zoya", "Kabir"];
    friends.push("Meera");
    show(friends.length);
39. 39.💾 What does this code show? (Positions start at 0.)
    let friends = ["Aman", "Arjun", "Zoya", "Kabir", "Riya"];
    show(friends[0]); (a) Arjun (b) Aman (c) Kabir (d) Zoya
40. 40.💾 What number does this code show?
    let score = 7;
    score = score - 6;
    score = score + 1;
    show(score);

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