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App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 916 · 40 questions
TalentJR

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.

NameDateTime takenScore ___ / 40
  1. 1.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
  2. 2.💾 In most code, the first item of a list is at position ___. (a) 0 (b) 2 (c) 10 (d) 1
  3. 3.💾 pop() takes off the last item. What does this code show?
    let notes = ["Sports", "Art", "Science"];
    notes.pop();
    show(notes[notes.length - 1]);     (a) Sports (b) Science (c) Art
  4. 4.💾 What number does this code show?
    let coins = 5;
    coins = coins - 5;
    coins = coins + 4;
    show(coins);
  5. 5.💾 What number does this code show?
    let stars = 8;
    stars = stars - 7;
    stars = stars + 1;
    show(stars);
  6. 6.True or false: a draft you are typing fits saving in the cloud. (a) True (b) False
  7. 7.True or false: photos on two devices fits saving on the phone. (a) False (b) True
  8. 8.💾 Where should the app save your last game level: on the phone or in the cloud? (a) in the cloud (b) on the phone
  9. 9.💾 pop() takes off the last item. What does this code show?
    let friends = ["Meera", "Kabir", "Arjun", "Riya"];
    friends.pop();
    show(friends[friends.length - 1]);     (a) Arjun (b) Riya (c) Meera (d) Kabir
  10. 10.💾 pop() takes off the last item. What does this code show?
    let songs = ["Ocean", "Kites", "Monsoon"];
    songs.pop();
    show(songs[songs.length - 1]);     (a) Ocean (b) Monsoon (c) Kites
  11. 11.💾 What number does this code show?
    let songs = ["Rain", "Monsoon", "Stars", "Ocean"];
    songs.push("Kites");
    songs.push("Sunrise");
    show(songs.length);
  12. 12.💾 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
  13. 13.💾 What is a variable? (a) a phone setting (b) a picture (c) a named box for a value (d) a type of screen
  14. 14.💾 pop() takes off the last item. What does this code show?
    let friends = ["Aman", "Meera", "Riya", "Zoya", "Kabir"];
    friends.pop();
    show(friends[friends.length - 1]);     (a) Meera (b) Aman (c) Zoya (d) Riya
  15. 15.💾 What does this code show? (Positions start at 0.)
    let songs = ["Stars", "Sunrise", "Monsoon", "Ocean"];
    show(songs[0]);     (a) Sunrise (b) Ocean (c) Monsoon (d) Stars
  16. 16.Which of these fits saving on the phone? (a) a class leaderboard (b) notes to read offline (c) chat messages to friends (d) a shared to-do list
  17. 17.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Science", "Hindi", "Maths"];
    show(notes[2]);     (a) Maths (b) Hindi (c) Science (d) Art
  18. 18.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) chat messages to friends
  19. 19.💾 Saving data in the cloud lets you ___. (a) shrink the app (b) never need a password (c) skip the internet (d) use it on any device
  20. 20.True or false: the sound on/off setting fits saving on the phone. (a) True (b) False
  21. 21.Which of these fits saving in the cloud? (a) notes to read offline (b) the sound on/off setting (c) a draft you are typing (d) chat messages to friends
  22. 22.💾 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
  23. 23.Which of these fits saving in the cloud? (a) your last game level (b) a class leaderboard (c) notes to read offline (d) a draft you are typing
  24. 24.💾 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
  25. 25.💾 Which can hold many values in order? (a) a single number (b) a switch (c) a button (d) a list
  26. 26.True or false: your last game level fits saving in the cloud. (a) True (b) False
  27. 27.💾 What number does this code show?
    let songs = ["Ocean", "Monsoon", "Sunrise"];
    songs.push("Rain");
    songs.push("Stars");
    show(songs.length);
  28. 28.💾 What number does this code show?
    let notes = ["Maths", "Art", "Science", "Music"];
    notes.push("Hindi");
    show(notes.length);
  29. 29.💾 What number does this code show?
    let notes = ["Sports", "Science", "Music"];
    notes.push("Hindi");
    show(notes.length);
  30. 30.💾 What number does this code show?
    let stars = 5;
    stars = stars - 5;
    stars = stars + 3;
    show(stars);
  31. 31.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Art", "Music", "Science", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]);     (a) Music (b) Art (c) Science (d) Hindi
  32. 32.💾 Data saved only on the phone is lost when ___. (a) you send a message (b) the phone is lost (c) the app is closed (d) the screen turns off
  33. 33.💾 pop() takes off the last item. What does this code show?
    let songs = ["Monsoon", "Stars", "Sunrise"];
    songs.pop();
    show(songs[songs.length - 1]);     (a) Stars (b) Sunrise (c) Monsoon
  34. 34.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) in the cloud (b) on the phone
  35. 35.💾 pop() takes off the last item. What does this code show?
    let friends = ["Aman", "Meera", "Arjun", "Kabir", "Zoya"];
    friends.pop();
    show(friends[friends.length - 1]);     (a) Meera (b) Arjun (c) Kabir (d) Aman
  36. 36.True or false: notes to read offline fits saving in the cloud. (a) False (b) True
  37. 37.💾 What number does this code show?
    let stars = 9;
    stars = stars - 1;
    stars = stars + 5;
    show(stars);
  38. 38.💾 pop() takes off the last item. What does this code show?
    let friends = ["Kabir", "Riya", "Arjun"];
    friends.pop();
    show(friends[friends.length - 1]);     (a) Arjun (b) Kabir (c) Riya
  39. 39.💾 pop() takes off the last item. What does this code show?
    let songs = ["Sunrise", "Stars", "Rain", "Ocean", "Monsoon"];
    songs.pop();
    show(songs[songs.length - 1]);     (a) Stars (b) Rain (c) Ocean (d) Sunrise
  40. 40.True or false: a shared to-do list fits saving in the cloud. (a) False (b) True

Answer key

  1. in the cloud
  2. 0
  3. Art
  4. 4
  5. 2
  6. False
  7. False
  8. on the phone
  9. Arjun
  10. Kites
  11. 6
  12. on the phone
  13. a named box for a value
  14. Zoya
  15. Stars
  16. notes to read offline
  17. Hindi
  18. a draft you are typing
  19. use it on any device
  20. True
  21. chat messages to friends
  22. data saved on the phone
  23. a class leaderboard
  24. in the cloud
  25. a list
  26. False
  27. 5
  28. 5
  29. 4
  30. 3
  31. Science
  32. the phone is lost
  33. Stars
  34. in the cloud
  35. Kabir
  36. False
  37. 13
  38. Riya
  39. Ocean
  40. True

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