App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 673 · 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.💾 pop() takes off the last item. What does this code show?
   let notes = ["Art", "Sports", "Maths", "Hindi", "Music"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Art (b) Maths (c) Hindi (d) Sports
2. 2.💾 What number does this code show?
   let coins = 9;
   coins = coins - 8;
   coins = coins + 5;
   show(coins);
3. 3.💾 What number does this code show?
   let points = 6;
   points = points - 5;
   points = points + 4;
   show(points);
4. 4.True or false: photos on two devices fits saving on the phone. (a) True (b) False
5. 5.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) on the phone (b) in the cloud
6. 6.True or false: a shared to-do list fits saving on the phone. (a) True (b) False
7. 7.💾 What number does this code show?
   let friends = ["Riya", "Kabir", "Zoya"];
   friends.push("Meera");
   friends.push("Arjun");
   show(friends.length);
8. 8.💾 What is a variable? (a) a type of screen (b) a phone setting (c) a picture (d) a named box for a value
9. 9.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
10. 10.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Science", "Maths", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Art (b) Science (c) Music (d) Maths
11. 11.💾 pop() takes off the last item. What does this code show?
    let songs = ["Monsoon", "Stars", "Kites", "Sunrise"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Kites (b) Stars (c) Sunrise (d) Monsoon
12. 12.True or false: chat messages to friends fits saving on the phone. (a) True (b) False
13. 13.💾 Which can hold many values in order? (a) a single number (b) a switch (c) a button (d) a list
14. 14.💾 What number does this code show?
    let friends = ["Zoya", "Meera", "Kabir", "Riya"];
    friends.push("Aman");
    show(friends.length);
15. 15.Which of these fits saving on the phone? (a) chat messages to friends (b) a shared to-do list (c) your last game level (d) a class leaderboard
16. 16.💾 Data saved only on the phone is lost when ___. (a) you send a message (b) the phone is lost (c) the screen turns off (d) the app is closed
17. 17.True or false: your last game level fits saving in the cloud. (a) False (b) True
18. 18.💾 What number does this code show?
    let friends = ["Zoya", "Meera", "Arjun"];
    friends.push("Aman");
    friends.push("Kabir");
    show(friends.length);
19. 19.Which of these fits saving in the cloud? (a) a class leaderboard (b) the sound on/off setting (c) your last game level (d) a draft you are typing
20. 20.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
21. 21.💾 What number does this code show?
    let notes = ["Art", "Maths", "Hindi", "Science"];
    notes.push("Music");
    show(notes.length);
22. 22.💾 What number does this code show?
    let friends = ["Kabir", "Meera"];
    friends.push("Arjun");
    show(friends.length);
23. 23.💾 What number does this code show?
    let songs = ["Monsoon", "Ocean"];
    songs.push("Kites");
    songs.push("Rain");
    show(songs.length);
24. 24.True or false: the sound on/off setting fits saving on the phone. (a) False (b) True
25. 25.💾 Where should the app save the sound on/off setting: on the phone or in the cloud? (a) in the cloud (b) on the phone
26. 26.True or false: your last game level fits saving on the phone. (a) True (b) False
27. 27.💾 What number does this code show?
    let songs = ["Rain", "Sunrise"];
    songs.push("Ocean");
    show(songs.length);
28. 28.💾 What number does this code show?
    let friends = ["Meera", "Aman"];
    friends.push("Kabir");
    show(friends.length);
29. 29.💾 pop() takes off the last item. What does this code show?
    let notes = ["Music", "Hindi", "Art"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Hindi (b) Music (c) Art
30. 30.Which of these fits saving in the cloud? (a) a draft you are typing (b) your last game level (c) notes to read offline (d) chat messages to friends
31. 31.True or false: photos on two devices fits saving in the cloud. (a) True (b) False
32. 32.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
33. 33.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Art", "Science"];
    show(notes[0]); (a) Science (b) Hindi (c) Art
34. 34.💾 What number does this code show?
    let notes = ["Sports", "Maths"];
    notes.push("Art");
    show(notes.length);
35. 35.True or false: the sound on/off setting fits saving in the cloud. (a) False (b) True
36. 36.💾 What number does this code show?
    let friends = ["Arjun", "Aman", "Meera", "Kabir"];
    friends.push("Riya");
    show(friends.length);
37. 37.True or false: a draft you are typing fits saving in the cloud. (a) False (b) True
38. 38.True or false: a class leaderboard fits saving on the phone. (a) True (b) False
39. 39.💾 Which works with no internet at all? (a) a cloud backup (b) a cloud leaderboard (c) a shared chat (d) data saved on the phone
40. 40.Which of these fits saving on the phone? (a) a class leaderboard (b) chat messages to friends (c) photos on two devices (d) the sound on/off setting

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