App Dev Worksheet: Variables, Lists and Saving

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

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