App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 647 · 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", "Hindi", "Sports", "Science"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Sports (b) Art (c) Science (d) Hindi
2. 2.💾 What number does this code show?
   let score = 8;
   score = score - 2;
   score = score + 1;
   show(score);
3. 3.💾 pop() takes off the last item. What does this code show?
   let notes = ["Sports", "Maths", "Science", "Hindi", "Art"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Hindi (b) Science (c) Maths (d) Sports
4. 4.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
5. 5.💾 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
6. 6.💾 What does this code show? (Positions start at 0.)
   let friends = ["Meera", "Aman", "Arjun", "Zoya", "Kabir"];
   show(friends[4]); (a) Arjun (b) Aman (c) Meera (d) Kabir
7. 7.True or false: photos on two devices fits saving on the phone. (a) True (b) False
8. 8.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
9. 9.💾 Which works with no internet at all? (a) data saved on the phone (b) a shared chat (c) a cloud backup (d) a cloud leaderboard
10. 10.💾 What number does this code show?
    let coins = 5;
    coins = coins - 4;
    coins = coins + 5;
    show(coins);
11. 11.Which of these fits saving in the cloud? (a) a class leaderboard (b) your last game level (c) the sound on/off setting (d) notes to read offline
12. 12.Which of these fits saving in the cloud? (a) your last game level (b) a draft you are typing (c) the sound on/off setting (d) a shared to-do list
13. 13.💾 What number does this code show?
    let points = 7;
    points = points - 2;
    points = points + 1;
    show(points);
14. 14.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
15. 15.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Art", "Sports", "Science"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Science (b) Sports (c) Art (d) Hindi
16. 16.Which of these fits saving on the phone? (a) a shared to-do list (b) chat messages to friends (c) your last game level (d) a class leaderboard
17. 17.💾 Data saved only on the phone is lost when ___. (a) the screen turns off (b) you send a message (c) the phone is lost (d) the app is closed
18. 18.Which of these fits saving on the phone? (a) a shared to-do list (b) chat messages to friends (c) the sound on/off setting (d) photos on two devices
19. 19.💾 pop() takes off the last item. What does this code show?
    let friends = ["Zoya", "Riya", "Kabir"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Zoya (b) Kabir (c) Riya
20. 20.True or false: chat messages to friends fits saving in the cloud. (a) False (b) True
21. 21.💾 pop() takes off the last item. What does this code show?
    let notes = ["Science", "Art", "Music", "Hindi", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Music (b) Art (c) Science (d) Hindi
22. 22.💾 pop() takes off the last item. What does this code show?
    let notes = ["Sports", "Hindi", "Science", "Maths", "Art"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Maths (b) Hindi (c) Sports (d) Science
23. 23.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Science", "Sports"];
    show(notes[1]); (a) Maths (b) Science (c) Sports
24. 24.💾 What number does this code show?
    let notes = ["Art", "Maths", "Science", "Sports"];
    notes.push("Music");
    show(notes.length);
25. 25.💾 What number does this code show?
    let points = 3;
    points = points - 1;
    points = points + 4;
    show(points);
26. 26.💾 What does this code show? (Positions start at 0.)
    let friends = ["Kabir", "Riya", "Meera"];
    show(friends[1]); (a) Kabir (b) Meera (c) Riya
27. 27.💾 pop() takes off the last item. What does this code show?
    let songs = ["Kites", "Ocean", "Monsoon", "Stars", "Rain"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Kites (b) Monsoon (c) Ocean (d) Stars
28. 28.Which of these fits saving in the cloud? (a) a draft you are typing (b) photos on two devices (c) notes to read offline (d) the sound on/off setting
29. 29.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
30. 30.💾 pop() takes off the last item. What does this code show?
    let friends = ["Riya", "Kabir", "Meera", "Arjun"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Meera (b) Arjun (c) Kabir (d) Riya
31. 31.Which of these fits saving on the phone? (a) photos on two devices (b) a shared to-do list (c) chat messages to friends (d) a draft you are typing
32. 32.💾 Saving data in the cloud lets you ___. (a) skip the internet (b) shrink the app (c) never need a password (d) use it on any device
33. 33.True or false: a draft you are typing fits saving in the cloud. (a) True (b) False
34. 34.💾 What does this code show? (Positions start at 0.)
    let notes = ["Science", "Hindi", "Art", "Maths"];
    show(notes[1]); (a) Science (b) Hindi (c) Art (d) Maths
35. 35.💾 pop() takes off the last item. What does this code show?
    let songs = ["Stars", "Monsoon", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Ocean (b) Monsoon (c) Stars
36. 36.Which of these fits saving in the cloud? (a) the sound on/off setting (b) chat messages to friends (c) notes to read offline (d) your last game level
37. 37.💾 pop() takes off the last item. What does this code show?
    let notes = ["Science", "Music", "Art"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Music (b) Art (c) Science
38. 38.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
39. 39.Which of these fits saving on the phone? (a) photos on two devices (b) a shared to-do list (c) notes to read offline (d) chat messages to friends
40. 40.💾 What does this code show? (Positions start at 0.)
    let notes = ["Science", "Art", "Sports"];
    show(notes[0]); (a) Art (b) Sports (c) Science

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