App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 591 · 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 the sound on/off setting: on the phone or in the cloud? (a) on the phone (b) in the cloud
2. 2.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) a draft you are typing
3. 3.Which of these fits saving in the cloud? (a) the sound on/off setting (b) notes to read offline (c) a class leaderboard (d) a draft you are typing
4. 4.Which of these fits saving on the phone? (a) a class leaderboard (b) your last game level (c) photos on two devices (d) chat messages to friends
5. 5.True or false: notes to read offline fits saving in the cloud. (a) False (b) True
6. 6.💾 What does this code show? (Positions start at 0.)
   let friends = ["Zoya", "Riya", "Aman", "Kabir", "Meera"];
   show(friends[0]); (a) Zoya (b) Riya (c) Aman (d) Kabir
7. 7.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
8. 8.💾 Saving data in the cloud lets you ___. (a) use it on any device (b) skip the internet (c) never need a password (d) shrink the app
9. 9.💾 Which can hold many values in order? (a) a button (b) a single number (c) a list (d) a switch
10. 10.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) on the phone (b) in the cloud
11. 11.💾 What is a variable? (a) a type of screen (b) a picture (c) a phone setting (d) a named box for a value
12. 12.True or false: photos on two devices fits saving on the phone. (a) False (b) True
13. 13.Which of these fits saving on the phone? (a) a shared to-do list (b) photos on two devices (c) a draft you are typing (d) a class leaderboard
14. 14.💾 What number does this code show?
    let lives = 5;
    lives = lives - 2;
    lives = lives + 5;
    show(lives);
15. 15.True or false: a draft you are typing fits saving on the phone. (a) True (b) False
16. 16.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
17. 17.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Music", "Sports", "Art", "Science"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Maths (b) Sports (c) Art (d) Music
18. 18.💾 What number does this code show?
    let friends = ["Kabir", "Meera", "Aman"];
    friends.push("Zoya");
    friends.push("Riya");
    show(friends.length);
19. 19.True or false: your last game level fits saving on the phone. (a) False (b) True
20. 20.💾 What number does this code show?
    let friends = ["Riya", "Zoya", "Kabir"];
    friends.push("Aman");
    friends.push("Arjun");
    show(friends.length);
21. 21.💾 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
22. 22.💾 What number does this code show?
    let friends = ["Meera", "Riya"];
    friends.push("Zoya");
    friends.push("Arjun");
    show(friends.length);
23. 23.💾 What does this code show? (Positions start at 0.)
    let friends = ["Kabir", "Riya", "Aman"];
    show(friends[1]); (a) Riya (b) Aman (c) Kabir
24. 24.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
25. 25.💾 What does this code show? (Positions start at 0.)
    let friends = ["Riya", "Zoya", "Arjun"];
    show(friends[1]); (a) Zoya (b) Arjun (c) Riya
26. 26.💾 pop() takes off the last item. What does this code show?
    let friends = ["Meera", "Arjun", "Aman"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Meera (b) Arjun (c) Aman
27. 27.True or false: a class leaderboard fits saving in the cloud. (a) True (b) False
28. 28.💾 What number does this code show?
    let notes = ["Music", "Maths", "Science"];
    notes.push("Sports");
    show(notes.length);
29. 29.💾 Which works with no internet at all? (a) a cloud leaderboard (b) data saved on the phone (c) a cloud backup (d) a shared chat
30. 30.💾 pop() takes off the last item. What does this code show?
    let songs = ["Rain", "Kites", "Sunrise", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Sunrise (b) Kites (c) Rain (d) Ocean
31. 31.💾 What number does this code show?
    let notes = ["Maths", "Art", "Sports", "Music"];
    notes.push("Science");
    notes.push("Hindi");
    show(notes.length);
32. 32.True or false: chat messages to friends fits saving on the phone. (a) True (b) False
33. 33.Which of these fits saving in the cloud? (a) a shared to-do list (b) your last game level (c) notes to read offline (d) the sound on/off setting
34. 34.True or false: a draft you are typing fits saving in the cloud. (a) False (b) True
35. 35.💾 In most code, the first item of a list is at position ___. (a) 10 (b) 0 (c) 2 (d) 1
36. 36.💾 pop() takes off the last item. What does this code show?
    let songs = ["Stars", "Ocean", "Monsoon", "Sunrise", "Kites"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Ocean (b) Monsoon (c) Sunrise (d) Stars
37. 37.💾 What does this code show? (Positions start at 0.)
    let songs = ["Monsoon", "Ocean", "Sunrise", "Rain", "Kites"];
    show(songs[0]); (a) Monsoon (b) Ocean (c) Rain (d) Sunrise
38. 38.💾 What number does this code show?
    let coins = 7;
    coins = coins - 6;
    coins = coins + 2;
    show(coins);
39. 39.True or false: the sound on/off setting fits saving on the phone. (a) False (b) True
40. 40.True or false: a shared to-do list fits saving on the phone. (a) False (b) True

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