App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 741 · 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) in the cloud (b) on the phone
2. 2.💾 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
3. 3.💾 What does this code show? (Positions start at 0.)
   let songs = ["Kites", "Stars", "Sunrise", "Rain"];
   show(songs[2]); (a) Stars (b) Sunrise (c) Kites (d) Rain
4. 4.Which of these fits saving in the cloud? (a) a shared to-do list (b) a draft you are typing (c) the sound on/off setting (d) your last game level
5. 5.💾 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
6. 6.💾 What number does this code show?
   let notes = ["Music", "Hindi"];
   notes.push("Sports");
   show(notes.length);
7. 7.💾 What number does this code show?
   let coins = 3;
   coins = coins - 2;
   coins = coins + 1;
   show(coins);
8. 8.True or false: photos on two devices fits saving in the cloud. (a) True (b) False
9. 9.💾 Which can hold many values in order? (a) a single number (b) a switch (c) a button (d) a list
10. 10.💾 What number does this code show?
    let songs = ["Monsoon", "Ocean", "Stars", "Rain"];
    songs.push("Sunrise");
    show(songs.length);
11. 11.💾 What number does this code show?
    let notes = ["Sports", "Art"];
    notes.push("Maths");
    show(notes.length);
12. 12.True or false: chat messages to friends fits saving on the phone. (a) True (b) False
13. 13.💾 What number does this code show?
    let coins = 8;
    coins = coins - 1;
    coins = coins + 5;
    show(coins);
14. 14.💾 What number does this code show?
    let coins = 7;
    coins = coins - 2;
    coins = coins + 5;
    show(coins);
15. 15.True or false: photos on two devices fits saving on the phone. (a) False (b) True
16. 16.💾 What is a variable? (a) a type of screen (b) a phone setting (c) a named box for a value (d) a picture
17. 17.💾 In most code, the first item of a list is at position ___. (a) 10 (b) 0 (c) 1 (d) 2
18. 18.True or false: a shared to-do list fits saving in the cloud. (a) False (b) True
19. 19.Which of these fits saving in the cloud? (a) your last game level (b) the sound on/off setting (c) a draft you are typing (d) a class leaderboard
20. 20.💾 Data saved only on the phone is lost when ___. (a) the phone is lost (b) you send a message (c) the app is closed (d) the screen turns off
21. 21.True or false: a shared to-do list fits saving on the phone. (a) True (b) False
22. 22.💾 pop() takes off the last item. What does this code show?
    let friends = ["Arjun", "Zoya", "Aman", "Meera"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Meera (b) Zoya (c) Arjun (d) Aman
23. 23.💾 Which works with no internet at all? (a) a shared chat (b) a cloud backup (c) a cloud leaderboard (d) data saved on the phone
24. 24.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) in the cloud (b) on the phone
25. 25.💾 What number does this code show?
    let friends = ["Meera", "Kabir", "Aman", "Arjun"];
    friends.push("Riya");
    show(friends.length);
26. 26.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
27. 27.Which of these fits saving on the phone? (a) photos on two devices (b) a draft you are typing (c) a shared to-do list (d) chat messages to friends
28. 28.💾 pop() takes off the last item. What does this code show?
    let songs = ["Stars", "Monsoon", "Ocean", "Rain"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Monsoon (b) Rain (c) Ocean (d) Stars
29. 29.💾 What number does this code show?
    let friends = ["Riya", "Meera", "Aman", "Kabir"];
    friends.push("Arjun");
    friends.push("Zoya");
    show(friends.length);
30. 30.💾 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
31. 31.💾 What number does this code show?
    let songs = ["Rain", "Sunrise"];
    songs.push("Kites");
    songs.push("Ocean");
    show(songs.length);
32. 32.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Music", "Sports"];
    show(notes[0]); (a) Sports (b) Music (c) Hindi
33. 33.💾 What does this code show? (Positions start at 0.)
    let friends = ["Aman", "Kabir", "Arjun", "Riya"];
    show(friends[0]); (a) Kabir (b) Riya (c) Aman (d) Arjun
34. 34.💾 Saving data in the cloud lets you ___. (a) use it on any device (b) shrink the app (c) skip the internet (d) never need a password
35. 35.💾 What number does this code show?
    let score = 5;
    score = score - 2;
    score = score + 4;
    show(score);
36. 36.True or false: notes to read offline fits saving in the cloud. (a) False (b) True
37. 37.True or false: a draft you are typing fits saving on the phone. (a) True (b) False
38. 38.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
39. 39.💾 What number does this code show?
    let notes = ["Sports", "Hindi"];
    notes.push("Maths");
    show(notes.length);
40. 40.💾 pop() takes off the last item. What does this code show?
    let friends = ["Riya", "Meera", "Kabir", "Aman", "Zoya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Meera (b) Aman (c) Riya (d) Kabir

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