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App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 852 · 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.💾 What number does this code show?
    let stars = 6;
    stars = stars - 4;
    stars = stars + 3;
    show(stars);
  2. 2.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
  3. 3.True or false: photos on two devices fits saving in the cloud. (a) True (b) False
  4. 4.True or false: a shared to-do list 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.Which of these fits saving in the cloud? (a) notes to read offline (b) a class leaderboard (c) the sound on/off setting (d) a draft you are typing
  7. 7.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Science", "Sports", "Music", "Art"];
    notes.pop();
    show(notes[notes.length - 1]);     (a) Hindi (b) Music (c) Science (d) Sports
  8. 8.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Science", "Sports"];
    notes.pop();
    show(notes[notes.length - 1]);     (a) Art (b) Science (c) Sports
  9. 9.💾 What number does this code show?
    let friends = ["Meera", "Kabir"];
    friends.push("Aman");
    show(friends.length);
  10. 10.💾 What does this code show? (Positions start at 0.)
    let notes = ["Sports", "Science", "Hindi", "Maths", "Music"];
    show(notes[0]);     (a) Science (b) Maths (c) Sports (d) Hindi
  11. 11.💾 What number does this code show?
    let songs = ["Kites", "Sunrise"];
    songs.push("Rain");
    show(songs.length);
  12. 12.💾 What number does this code show?
    let friends = ["Meera", "Arjun"];
    friends.push("Aman");
    show(friends.length);
  13. 13.💾 pop() takes off the last item. What does this code show?
    let notes = ["Sports", "Maths", "Hindi"];
    notes.pop();
    show(notes[notes.length - 1]);     (a) Hindi (b) Sports (c) Maths
  14. 14.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
  15. 15.True or false: notes to read offline fits saving on the phone. (a) False (b) True
  16. 16.💾 What number does this code show?
    let points = 8;
    points = points - 2;
    points = points + 5;
    show(points);
  17. 17.Which of these fits saving in the cloud? (a) notes to read offline (b) chat messages to friends (c) a draft you are typing (d) the sound on/off setting
  18. 18.💾 What is a variable? (a) a type of screen (b) a phone setting (c) a named box for a value (d) a picture
  19. 19.💾 What number does this code show?
    let songs = ["Stars", "Ocean"];
    songs.push("Kites");
    show(songs.length);
  20. 20.💾 What number does this code show?
    let score = 5;
    score = score - 2;
    score = score + 1;
    show(score);
  21. 21.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Science", "Maths", "Sports"];
    show(notes[3]);     (a) Sports (b) Maths (c) Science (d) Hindi
  22. 22.💾 What number does this code show?
    let notes = ["Maths", "Hindi"];
    notes.push("Music");
    notes.push("Science");
    show(notes.length);
  23. 23.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Sports", "Science"];
    notes.pop();
    show(notes[notes.length - 1]);     (a) Hindi (b) Sports (c) Science
  24. 24.True or false: a draft you are typing fits saving in the cloud. (a) True (b) False
  25. 25.💾 What number does this code show?
    let lives = 4;
    lives = lives - 4;
    lives = lives + 5;
    show(lives);
  26. 26.💾 pop() takes off the last item. What does this code show?
    let songs = ["Sunrise", "Ocean", "Stars"];
    songs.pop();
    show(songs[songs.length - 1]);     (a) Sunrise (b) Stars (c) Ocean
  27. 27.💾 What number does this code show?
    let friends = ["Meera", "Arjun", "Kabir"];
    friends.push("Riya");
    friends.push("Aman");
    show(friends.length);
  28. 28.💾 What number does this code show?
    let friends = ["Kabir", "Meera", "Zoya", "Riya"];
    friends.push("Aman");
    show(friends.length);
  29. 29.💾 What number does this code show?
    let songs = ["Rain", "Kites", "Monsoon", "Sunrise"];
    songs.push("Stars");
    songs.push("Ocean");
    show(songs.length);
  30. 30.💾 What number does this code show?
    let score = 9;
    score = score - 3;
    score = score + 1;
    show(score);
  31. 31.💾 Saving data in the cloud lets you ___. (a) use it on any device (b) never need a password (c) shrink the app (d) skip the internet
  32. 32.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Maths", "Sports", "Hindi"];
    notes.pop();
    show(notes[notes.length - 1]);     (a) Art (b) Maths (c) Hindi (d) Sports
  33. 33.💾 What number does this code show?
    let points = 7;
    points = points - 6;
    points = points + 2;
    show(points);
  34. 34.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) photos on two devices
  35. 35.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Music", "Sports", "Hindi", "Maths"];
    show(notes[0]);     (a) Art (b) Music (c) Hindi (d) Sports
  36. 36.💾 Which works with no internet at all? (a) a shared chat (b) a cloud leaderboard (c) a cloud backup (d) data saved on the phone
  37. 37.💾 What number does this code show?
    let notes = ["Science", "Hindi", "Music"];
    notes.push("Sports");
    notes.push("Maths");
    show(notes.length);
  38. 38.💾 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
  39. 39.💾 What number does this code show?
    let songs = ["Monsoon", "Sunrise", "Rain"];
    songs.push("Stars");
    songs.push("Kites");
    show(songs.length);
  40. 40.True or false: your last game level fits saving in the cloud. (a) True (b) False

Answer key

  1. 5
  2. on the phone
  3. True
  4. False
  5. on the phone
  6. a class leaderboard
  7. Music
  8. Science
  9. 3
  10. Sports
  11. 3
  12. 3
  13. Maths
  14. False
  15. True
  16. 11
  17. chat messages to friends
  18. a named box for a value
  19. 3
  20. 4
  21. Sports
  22. 4
  23. Sports
  24. False
  25. 5
  26. Ocean
  27. 5
  28. 5
  29. 6
  30. 7
  31. use it on any device
  32. Sports
  33. 3
  34. photos on two devices
  35. Art
  36. data saved on the phone
  37. 5
  38. on the phone
  39. 5
  40. False

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