App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 740 · 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.True or false: a shared to-do list fits saving in the cloud. (a) False (b) True
3. 3.💾 Where should the app save a class leaderboard: 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) notes to read offline (b) the sound on/off setting (c) your last game level (d) photos on two devices
5. 5.Which of these fits saving on the phone? (a) a class leaderboard (b) the sound on/off setting (c) a shared to-do list (d) chat messages to friends
6. 6.💾 Data saved only on the phone is lost when ___. (a) you send a message (b) the app is closed (c) the screen turns off (d) the phone is lost
7. 7.Which of these fits saving in the cloud? (a) a class leaderboard (b) a draft you are typing (c) the sound on/off setting (d) your last game level
8. 8.💾 What number does this code show?
   let friends = ["Aman", "Zoya", "Riya", "Arjun"];
   friends.push("Kabir");
   show(friends.length);
9. 9.True or false: notes to read offline fits saving on the phone. (a) True (b) False
10. 10.💾 What number does this code show?
    let lives = 3;
    lives = lives - 3;
    lives = lives + 5;
    show(lives);
11. 11.💾 Which works with no internet at all? (a) a shared chat (b) a cloud backup (c) data saved on the phone (d) a cloud leaderboard
12. 12.Which of these fits saving on the phone? (a) a class leaderboard (b) a shared to-do list (c) your last game level (d) chat messages to friends
13. 13.💾 What number does this code show?
    let lives = 8;
    lives = lives - 6;
    lives = lives + 3;
    show(lives);
14. 14.💾 What number does this code show?
    let score = 6;
    score = score - 1;
    score = score + 1;
    show(score);
15. 15.💾 Saving data in the cloud lets you ___. (a) skip the internet (b) use it on any device (c) never need a password (d) shrink the app
16. 16.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
17. 17.💾 What number does this code show?
    let score = 7;
    score = score - 2;
    score = score + 1;
    show(score);
18. 18.💾 What is a variable? (a) a phone setting (b) a picture (c) a named box for a value (d) a type of screen
19. 19.💾 pop() takes off the last item. What does this code show?
    let notes = ["Science", "Maths", "Art", "Hindi"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Maths (b) Hindi (c) Science (d) Art
20. 20.💾 What number does this code show?
    let notes = ["Maths", "Sports", "Music"];
    notes.push("Art");
    show(notes.length);
21. 21.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Hindi", "Science", "Music", "Art"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Science (b) Music (c) Hindi (d) Maths
22. 22.💾 What number does this code show?
    let coins = 4;
    coins = coins - 3;
    coins = coins + 4;
    show(coins);
23. 23.True or false: chat messages to friends fits saving in the cloud. (a) False (b) True
24. 24.💾 pop() takes off the last item. What does this code show?
    let friends = ["Meera", "Riya", "Kabir"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Kabir (b) Riya (c) Meera
25. 25.💾 What number does this code show?
    let songs = ["Stars", "Sunrise", "Kites"];
    songs.push("Monsoon");
    show(songs.length);
26. 26.💾 What number does this code show?
    let lives = 3;
    lives = lives - 1;
    lives = lives + 3;
    show(lives);
27. 27.True or false: photos on two devices fits saving on the phone. (a) False (b) True
28. 28.💾 pop() takes off the last item. What does this code show?
    let friends = ["Kabir", "Aman", "Meera"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Aman (b) Kabir (c) Meera
29. 29.True or false: a draft you are typing fits saving in the cloud. (a) True (b) False
30. 30.💾 pop() takes off the last item. What does this code show?
    let friends = ["Arjun", "Zoya", "Riya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Riya (b) Zoya (c) Arjun
31. 31.💾 pop() takes off the last item. What does this code show?
    let songs = ["Stars", "Sunrise", "Rain", "Ocean", "Kites"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Ocean (b) Stars (c) Sunrise (d) Rain
32. 32.💾 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
33. 33.💾 Which can hold many values in order? (a) a list (b) a button (c) a switch (d) a single number
34. 34.Which of these fits saving on the phone? (a) photos on two devices (b) notes to read offline (c) a class leaderboard (d) chat messages to friends
35. 35.Which of these fits saving in the cloud? (a) the sound on/off setting (b) your last game level (c) chat messages to friends (d) notes to read offline
36. 36.💾 What number does this code show?
    let songs = ["Kites", "Stars", "Sunrise", "Rain"];
    songs.push("Ocean");
    songs.push("Monsoon");
    show(songs.length);
37. 37.True or false: photos on two devices fits saving in the cloud. (a) True (b) False
38. 38.💾 What number does this code show?
    let notes = ["Maths", "Art", "Science"];
    notes.push("Hindi");
    notes.push("Sports");
    show(notes.length);
39. 39.💾 What number does this code show?
    let coins = 5;
    coins = coins - 3;
    coins = coins + 1;
    show(coins);
40. 40.💾 What does this code show? (Positions start at 0.)
    let friends = ["Riya", "Arjun", "Meera", "Kabir"];
    show(friends[3]); (a) Riya (b) Arjun (c) Kabir (d) Meera

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