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App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 777 · 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.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Science", "Music", "Hindi", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]);     (a) Music (b) Science (c) Art (d) Hindi
  2. 2.Which of these fits saving on the phone? (a) chat messages to friends (b) the sound on/off setting (c) a class leaderboard (d) a shared to-do list
  3. 3.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
  4. 4.Which of these fits saving on the phone? (a) notes to read offline (b) a shared to-do list (c) chat messages to friends (d) a class leaderboard
  5. 5.True or false: a draft you are typing fits saving on the phone. (a) False (b) True
  6. 6.💾 What number does this code show?
    let points = 6;
    points = points - 5;
    points = points + 4;
    show(points);
  7. 7.True or false: photos on two devices fits saving on the phone. (a) False (b) True
  8. 8.Which of these fits saving in the cloud? (a) your last game level (b) a class leaderboard (c) a draft you are typing (d) notes to read offline
  9. 9.💾 What number does this code show?
    let lives = 4;
    lives = lives - 3;
    lives = lives + 3;
    show(lives);
  10. 10.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) on the phone (b) in the cloud
  11. 11.💾 What number does this code show?
    let stars = 7;
    stars = stars - 1;
    stars = stars + 2;
    show(stars);
  12. 12.💾 What number does this code show?
    let notes = ["Science", "Art", "Music"];
    notes.push("Hindi");
    show(notes.length);
  13. 13.💾 Which can hold many values in order? (a) a switch (b) a list (c) a button (d) a single number
  14. 14.💾 What number does this code show?
    let friends = ["Kabir", "Arjun", "Aman"];
    friends.push("Meera");
    show(friends.length);
  15. 15.💾 What number does this code show?
    let notes = ["Sports", "Maths", "Art", "Science"];
    notes.push("Music");
    notes.push("Hindi");
    show(notes.length);
  16. 16.💾 What number does this code show?
    let score = 8;
    score = score - 1;
    score = score + 3;
    show(score);
  17. 17.💾 What does this code show? (Positions start at 0.)
    let friends = ["Aman", "Zoya", "Riya", "Kabir"];
    show(friends[1]);     (a) Kabir (b) Zoya (c) Aman (d) Riya
  18. 18.Which of these fits saving in the cloud? (a) the sound on/off setting (b) a shared to-do list (c) a draft you are typing (d) notes to read offline
  19. 19.💾 What does this code show? (Positions start at 0.)
    let friends = ["Meera", "Riya", "Kabir"];
    show(friends[2]);     (a) Meera (b) Kabir (c) Riya
  20. 20.💾 pop() takes off the last item. What does this code show?
    let friends = ["Arjun", "Meera", "Aman", "Riya", "Zoya"];
    friends.pop();
    show(friends[friends.length - 1]);     (a) Arjun (b) Meera (c) Aman (d) Riya
  21. 21.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Music", "Hindi", "Sports"];
    show(notes[0]);     (a) Music (b) Maths (c) Hindi (d) Sports
  22. 22.💾 What number does this code show?
    let friends = ["Meera", "Arjun", "Aman", "Zoya"];
    friends.push("Kabir");
    show(friends.length);
  23. 23.💾 What number does this code show?
    let notes = ["Music", "Art", "Hindi", "Sports"];
    notes.push("Science");
    notes.push("Maths");
    show(notes.length);
  24. 24.Which of these fits saving on the phone? (a) a shared to-do list (b) a draft you are typing (c) photos on two devices (d) chat messages to friends
  25. 25.💾 Where should the app save a draft you are typing: on the phone or in the cloud? (a) on the phone (b) in the cloud
  26. 26.True or false: the sound on/off setting fits saving in the cloud. (a) False (b) True
  27. 27.True or false: chat messages to friends fits saving on the phone. (a) True (b) False
  28. 28.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
  29. 29.💾 What number does this code show?
    let lives = 9;
    lives = lives - 9;
    lives = lives + 3;
    show(lives);
  30. 30.💾 pop() takes off the last item. What does this code show?
    let notes = ["Sports", "Music", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]);     (a) Maths (b) Music (c) Sports
  31. 31.💾 What is a variable? (a) a phone setting (b) a type of screen (c) a named box for a value (d) a picture
  32. 32.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
  33. 33.True or false: a class leaderboard fits saving on the phone. (a) True (b) False
  34. 34.💾 What does this code show? (Positions start at 0.)
    let friends = ["Meera", "Zoya", "Aman", "Riya"];
    show(friends[2]);     (a) Riya (b) Meera (c) Aman (d) Zoya
  35. 35.💾 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
  36. 36.💾 What number does this code show?
    let notes = ["Hindi", "Art", "Sports"];
    notes.push("Music");
    show(notes.length);
  37. 37.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Art", "Science"];
    notes.pop();
    show(notes[notes.length - 1]);     (a) Science (b) Art (c) Maths
  38. 38.💾 What does this code show? (Positions start at 0.)
    let notes = ["Sports", "Science", "Art"];
    show(notes[0]);     (a) Sports (b) Science (c) Art
  39. 39.💾 pop() takes off the last item. What does this code show?
    let songs = ["Monsoon", "Rain", "Sunrise"];
    songs.pop();
    show(songs[songs.length - 1]);     (a) Rain (b) Sunrise (c) Monsoon
  40. 40.💾 Saving data in the cloud lets you ___. (a) shrink the app (b) never need a password (c) use it on any device (d) skip the internet

Answer key

  1. Hindi
  2. the sound on/off setting
  3. in the cloud
  4. notes to read offline
  5. True
  6. 5
  7. False
  8. a class leaderboard
  9. 4
  10. on the phone
  11. 8
  12. 4
  13. a list
  14. 4
  15. 6
  16. 10
  17. Zoya
  18. a shared to-do list
  19. Kabir
  20. Riya
  21. Maths
  22. 5
  23. 6
  24. a draft you are typing
  25. on the phone
  26. False
  27. False
  28. True
  29. 3
  30. Music
  31. a named box for a value
  32. chat messages to friends
  33. False
  34. Aman
  35. in the cloud
  36. 4
  37. Art
  38. Sports
  39. Rain
  40. use it on any device

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